File Upload Progress Handling

December 20, 2024 · AI Conversations

User
<script>
import { ref } from 'vue';
import axios from "axios";

// Props
const props = defineProps({
  uploadUrl: {
    type: String,
    required: true,
  },
});
console.log("Upload URL:", props.uploadUrl);
// Emits
const emit = defineEmits(["fileUploaded"]);

// State
const files = ref([]);

const handleFileChange = (event) => {
  const selectedFiles = event.target.files;
  Array.from(selectedFiles).forEach((file) => uploadFile(file));
};

const handleDrop = (event) => {
  const droppedFiles = event.dataTransfer.files;
  Array.from(droppedFiles).forEach((file) => uploadFile(file));
};

const uploadFile = (file) => {
  const formData = new FormData();
  formData.append("file", file);

  const fileData = { name: file.name, progress: 0 };
  files.value.push(fileData);

  axios
    .post(props.uploadUrl, formData, {
      onUploadProgress: (progressEvent) => {
        const total = progressEvent.total;
        const loaded = progressEvent.loaded;

        console.log('Loaded:', loaded, 'Total:', total);
        if (total > 0) {
          fileData.progress = Math.round((loaded * 100) / total);
        }
      },
    })
    .then((response) => {
      console.log("Upload successful:", response.data);
      fileData.progress = 100;
      fileData.path = response.data.path; // Add the file path
      emit("fileUploaded", response.data); // Emit event with file data
    })
    .catch((error) => {
      console.error("File upload failed:", error);
    });
};
</script>
<style>
.drop-zone {
  border: 2px dashed #ccc;
  padding: 20px;
  text-align: center;
  cursor: pointer;
}
.drop-zone p {
  margin: 0;
  color: #999;
}
progress {
  width: 100%;
  margin-top: 5px;
}
</style>

{{ $t('Drag and drop files here or click to upload') }}
{{ $t('Upload Files') }}:

{{ file.name }} – {{ file.progress }}%

progress 100 not showing

Assistant
To troubleshoot the issue of the “ element not displaying as 100% after the file upload completes, let's consider a few possible reasons and solutions.

### Potential Issues and Solutions

1. **Progress State Update Timing**:
Ensure that you are correctly updating the progress state after the file upload completes. The `fileData.progress` should be updated to `100` once the upload is successful.

2. **Reactivity of `files` Array**:
Vue may not be detecting changes to the `files` array properly, especially if you modify properties of the object directly. To ensure reactivity, you might want to use `Vue.set()` or create a new object when you update the progress. However, in Vue 3, using the reactive property directly should suffice.

3. **Display of “ Element**:
If the “ element is not reflecting the updated progress value, check if there are any CSS styles or JavaScript that might be affecting its visibility or rendering.

### Revised Code

Here's an adjusted version of your code that ensures that the progress is updated correctly:

<script setup>
import { ref } from 'vue';
import axios from "axios";

// Props
const props = defineProps({
  uploadUrl: {
    type: String,
    required: true,
  },
});
console.log("Upload URL:", props.uploadUrl);
// Emits
const emit = defineEmits(["fileUploaded"]);

// State
const files = ref([]);

const handleFileChange = (event) => {
  const selectedFiles = event.target.files;
  Array.from(selectedFiles).forEach((file) => uploadFile(file));
};

const handleDrop = (event) => {
  const droppedFiles = event.dataTransfer.files;
  Array.from(droppedFiles).forEach((file) => uploadFile(file));
};

const uploadFile = (file) => {
  const formData = new FormData();
  formData.append("file", file);

  const fileData = { name: file.name, progress: 0 };
  files.value.push(fileData);

  axios
    .post(props.uploadUrl, formData, {
      onUploadProgress: (progressEvent) => {
        const total = progressEvent.total;
        const loaded = progressEvent.loaded;

        if (total > 0) {
          fileData.progress = Math.round((loaded * 100) / total);
        }
      },
    })
    .then((response) => {
      console.log("Upload successful:", response.data);
      // Ensure we create a new object for reactivity
      const updatedFileData = { ...fileData, progress: 100, path: response.data.path };
      const index = files.value.indexOf(fileData);
      if (index !== -1) {
        files.value[index] = updatedFileData; // Update the existing file data
      }
      emit("fileUploaded", response.data); // Emit event with file data
    })
    .catch((error) => {
      console.error("File upload failed:", error);
    });
};

</script>

<style>
.drop-zone {
  border: 2px dashed #ccc;
  padding: 20px;
  text-align: center;
  cursor: pointer;
}
.drop-zone p {
  margin: 0;
  color: #999;
}
progress {
  width: 100%;
  margin-top: 5px;
}
</style>

<template>
  <div class="drop-zone" @dragover.prevent @drop.prevent="handleDrop">
    <p v-if="!files.length">{{ $t('Drag and drop files here or click to upload') }} </p>
    <p v-else>{{ $t('Upload Files') }}:</p>
    <ul>
      <li v-for="file in files" :key="file.name">
        {{ file.name }} - {{ file.progress }}%
        <progress :value="file.progress" max="100"></progress>
      </li>
    </ul>
    <input type="file" multiple @change="handleFileChange" />
  </div>
</template>

### Key Changes

– **Creating a New Object for File Data**: When the upload is successful, instead of mutating the existing `fileData` directly, create a new object (`updatedFileData`) that includes the updated progress and path. This ensures Vue's reactivity system recognizes the change.

– **Updating the `files` Array**: Use `index` to find the existing `fileData` in the `files` array and replace it with the `updatedFileData`.

### Conclusion

With these adjustments, the progress should correctly display as 100% upon successful upload, and any issues with Vue's reactivity should be resolved. If you're still facing issues, double-check the console for any errors and ensure that the `uploadUrl` is correctly set and reachable.

User
we are useing vue 3
Assistant
User is using Vue 3 in their project.
Assistant
Since you're using Vue 3, the provided solution should work well, but let's clarify a few points specific to Vue 3 and ensure everything aligns with best practices.

### Updated Code for Vue 3

Here's the refined version, ensuring clarity and adherence to Vue 3 standards:

<script setup>
import { ref } from 'vue';
import axios from 'axios';

// Props
const props = defineProps({
  uploadUrl: {
    type: String,
    required: true,
  },
});

// Emits
const emit = defineEmits(['fileUploaded']);

// State
const files = ref([]);

const handleFileChange = (event) => {
  const selectedFiles = event.target.files;
  Array.from(selectedFiles).forEach((file) => uploadFile(file));
};

const handleDrop = (event) => {
  const droppedFiles = event.dataTransfer.files;
  Array.from(droppedFiles).forEach((file) => uploadFile(file));
};

const uploadFile = (file) => {
  const formData = new FormData();
  formData.append('file', file);

  // Create a new file object for tracking progress
  const fileData = { name: file.name, progress: 0 };
  files.value.push(fileData);

  axios
    .post(props.uploadUrl, formData, {
      onUploadProgress: (progressEvent) => {
        const total = progressEvent.total;
        const loaded = progressEvent.loaded;

        if (total > 0) {
          fileData.progress = Math.round((loaded * 100) / total);
        }
      },
    })
    .then((response) => {
      console.log('Upload successful:', response.data);
      // Update fileData to reflect completion
      const index = files.value.indexOf(fileData);
      if (index !== -1) {
        files.value[index] = { ...fileData, progress: 100, path: response.data.path };
      }
      emit('fileUploaded', response.data); // Emit event with file data
    })
    .catch((error) => {
      console.error('File upload failed:', error);
    });
};
</script>

<style>
.drop-zone {
  border: 2px dashed #ccc;
  padding: 20px;
  text-align: center;
  cursor: pointer;
}
.drop-zone p {
  margin: 0;
  color: #999;
}
progress {
  width: 100%;
  margin-top: 5px;
}
</style>

<template>
  <div class="drop-zone" @dragover.prevent @drop.prevent="handleDrop">
    <p v-if="!files.length">{{ $t('Drag and drop files here or click to upload') }}</p>
    <p v-else>{{ $t('Upload Files') }}:</p>
    <ul>
      <li v-for="file in files" :key="file.name">
        {{ file.name }} - {{ file.progress }}%
        <progress :value="file.progress" max="100"></progress>
      </li>
    </ul>
    <input type="file" multiple @change="handleFileChange" />
  </div>
</template>

### Key Points

1. **Reactivity**: In Vue 3, modifying properties of objects directly can sometimes lead to reactivity issues. By creating a new object for the updated `fileData` when the upload completes, you ensure that Vue's reactivity system recognizes the change.

2. **Destructuring for Clarity**: The `index` variable is used to find the correct file in the `files` array to update its progress. Using the spread operator (`…`) allows you to maintain the original data while updating the properties that have changed.

3. **Event Handling**: The use of `@dragover.prevent` and `@drop.prevent` ensures that the default drag-and-drop behavior is suppressed, allowing you to implement your custom logic.

4. **Progress Display**: Ensure that your “ elements are rendering correctly in your template. Since you're using Vue 3, the reactive updates should reflect in the DOM as expected.

### Conclusion

With these updates, your component should correctly handle file uploads, display progress, and update the progress bar to 100% upon successful upload. If you're still facing issues, ensure that no CSS styles are overriding the visibility or functionality of the “ element, and check for any JavaScript errors in the console.

User
but currently its showing 0% or direct 100% not increasing %
Assistant
If the progress percentage is showing as 0% or jumping directly to 100%, there are a few potential issues that could cause this behavior in your Vue 3 file upload component. Let's address them systematically:

### 1. Ensure `onUploadProgress` is Working Correctly

Make sure that the `onUploadProgress` callback is being called correctly and that `progressEvent` contains valid values for `loaded` and `total`. You can add console logs to check:

const uploadFile = (file) => {
  const formData = new FormData();
  formData.append('file', file);

  // Create a new file object for tracking progress
  const fileData = { name: file.name, progress: 0 };
  files.value.push(fileData);

  axios
    .post(props.uploadUrl, formData, {
      onUploadProgress: (progressEvent) => {
        const total = progressEvent.total;
        const loaded = progressEvent.loaded;

        console.log('Total:', total, 'Loaded:', loaded); // Check values

        if (total > 0) {
          fileData.progress = Math.round((loaded * 100) / total);
          console.log('Progress:', fileData.progress); // Log progress
        }
      },
    })
    .then((response) => {
      console.log('Upload successful:', response.data);
      const index = files.value.indexOf(fileData);
      if (index !== -1) {
        files.value[index] = { ...fileData, progress: 100, path: response.data.path };
      }
      emit('fileUploaded', response.data);
    })
    .catch((error) => {
      console.error('File upload failed:', error);
    });
};

### 2. Check Axios Version

Ensure you're using an Axios version that supports `onUploadProgress`. The feature is available in Axios 0.18.0 and later. You can check your version in `package.json` or by running:

npm list axios

### 3. File Size and Network Conditions

If you're testing with very small files or in a network environment that does not simulate upload latency well, you might not see gradual progress updates. Try testing with larger files to see if the progress updates more gradually.

### 4. Reactivity of the `files` Array

In your current implementation, since you're modifying the `progress` property of an object directly, Vue may not be triggering reactivity correctly. Instead, you can force Vue to track these changes by replacing the object in the `files` array:

const uploadFile = (file) => {
  const formData = new FormData();
  formData.append('file', file);

  const fileData = { name: file.name, progress: 0 };
  files.value.push(fileData);

  axios
    .post(props.uploadUrl, formData, {
      onUploadProgress: (progressEvent) => {
        const total = progressEvent.total;
        const loaded = progressEvent.loaded;

        if (total > 0) {
          // Create a new object to ensure reactivity
          const updatedFileData = { ...fileData, progress: Math.round((loaded * 100) / total) };
          const index = files.value.indexOf(fileData);
          if (index !== -1) {
            files.value[index] = updatedFileData; // Update to the new object
          }
        }
      },
    })
    .then((response) => {
      console.log('Upload successful:', response.data);
      const index = files.value.indexOf(fileData);
      if (index !== -1) {
        files.value[index] = { ...fileData, progress: 100, path: response.data.path };
      }
      emit('fileUploaded', response.data);
    })
    .catch((error) => {
      console.error('File upload failed:', error);
    });
};

### 5. Test in a Realistic Environment

Ensure you're testing in an environment that accurately simulates real upload conditions. Localhost may sometimes behave differently, especially with small files.

### 6. Verify Backend Configuration

Ensure your server-side is set up to handle file uploads and respond correctly. Sometimes, the backend response can affect how the frontend behaves.

### Conclusion

By adding detailed logging and ensuring the correct reactivity of the file progress updates, you should be able to observe the progress more accurately. If after these changes the issue persists, please share any error messages or specific console logs that appear during the upload process, and we can further investigate the problem.

User
console.log('Progress:', fileData.progress); showing 100 and total and loaded showing equql from first instacne
Assistant
If `console.log('Progress:', fileData.progress);` shows 100% immediately and the `total` and `loaded` values are equal from the first instance, it indicates that the upload progress events might not be firing correctly. This can happen for a few reasons:

### Possible Causes and Solutions

1. **File Size**:
– If you are uploading a very small file, it may upload instantly, leading to the `onUploadProgress` event being triggered only once and directly reflecting 100%. Test with larger files to see if the progress updates correctly.

2. **Browser and Network Conditions**:
– The browser's behavior can vary depending on network speed and conditions. If you are on a fast network, small files might upload too quickly to see incremental updates. Use a slower connection or simulate a poor network environment.

3. **Axios Configuration**:
– Ensure you are using the correct Axios version that supports `onUploadProgress`. Make sure there are no other configurations interfering with the progress events.

4. **Backend Response**:
– Ensure the backend is correctly set up to handle multipart form data. If the server is not responding appropriately, it could affect the progress event handling.

5. **Testing Setup**:
– If you're testing locally, consider deploying to a staging environment to see if the issue persists. Local development setups can behave differently than production environments.

### Additional Debugging Steps

To help diagnose the issue, consider adding more detailed logging and a small delay to simulate upload time:

const uploadFile = (file) => {
  const formData = new FormData();
  formData.append('file', file);

  const fileData = { name: file.name, progress: 0 };
  files.value.push(fileData);

  axios
    .post(props.uploadUrl, formData, {
      onUploadProgress: (progressEvent) => {
        const total = progressEvent.total;
        const loaded = progressEvent.loaded;

        console.log('Total:', total, 'Loaded:', loaded); // Log these values

        if (total > 0) {
          fileData.progress = Math.round((loaded * 100) / total);
          console.log('Progress:', fileData.progress); // Check progress
        }
      },
    })
    .then((response) => {
      console.log('Upload successful:', response.data);
      const index = files.value.indexOf(fileData);
      if (index !== -1) {
        files.value[index] = { ...fileData, progress: 100, path: response.data.path };
      }
      emit('fileUploaded', response.data);
    })
    .catch((error) => {
      console.error('File upload failed:', error);
    });
};

### Simulate Upload Delay

If you want to simulate a longer upload time for testing, you could introduce a delay using `setTimeout`:

const uploadFile = (file) => {
  const formData = new FormData();
  formData.append('file', file);

  const fileData = { name: file.name, progress: 0 };
  files.value.push(fileData);

  // Simulate a delay for the upload
  setTimeout(() => {
    axios
      .post(props.uploadUrl, formData, {
        onUploadProgress: (progressEvent) => {
          const total = progressEvent.total;
          const loaded = progressEvent.loaded;

          if (total > 0) {
            fileData.progress = Math.round((loaded * 100) / total);
            console.log('Progress:', fileData.progress);
          }
        },
      })
      .then((response) => {
        console.log('Upload successful:', response.data);
        const index = files.value.indexOf(fileData);
        if (index !== -1) {
          files.value[index] = { ...fileData, progress: 100, path: response.data.path };
        }
        emit('fileUploaded', response.data);
      })
      .catch((error) => {
        console.error('File upload failed:', error);
      });
  }, 1000); // Simulate a 1-second delay
};

### Conclusion

If you are still not seeing the expected progress updates, double-check the file sizes you're uploading and try testing with different files. Additionally, ensure that your backend server is set up to handle file uploads properly. If the issue continues, sharing the backend code that handles the upload might help further diagnose the problem.

User
still not showing increasing progreesssin bar its show 0 or 100
Assistant
If the progress bar is only showing 0% or 100% and not updating incrementally, there are a few potential issues we need to investigate further. Here’s a more detailed approach to ensure everything is set up correctly for displaying upload progress in your Vue 3 component.

### Key Areas to Check

1. **Correct Handling of Progress Events**: Make sure that the `onUploadProgress` event is correctly receiving progress data from Axios.

2. **File Size**: Ensure that you are uploading a sufficiently large file to see incremental progress updates. Small files might upload too quickly to register any progress.

3. **Browser and Network Conditions**: Test in different environments (local server, production server) and possibly under different network speeds.

4. **Backend Implementation**: Ensure your backend properly handles file uploads and responds correctly, especially in terms of the HTTP response.

### Updated Component

Here’s an updated version of your file upload component with additional debugging and structure:

<template>
  <div class="drop-zone" @dragover.prevent @drop.prevent="handleDrop">
    <p v-if="!files.length">{{ $t('Drag and drop files here or click to upload') }}</p>
    <p v-else>{{ $t('Upload Files') }}:</p>
    <ul>
      <li v-for="file in files" :key="file.name">
        {{ file.name }} - {{ file.progress }}%
        <progress :value="file.progress" max="100"></progress>
      </li>
    </ul>
    <input type="file" multiple @change="handleFileChange" />
  </div>
</template>

<script setup>
import { ref } from 'vue';
import axios from 'axios';

// Props
const props = defineProps({
  uploadUrl: {
    type: String,
    required: true,
  },
});

// Emits
const emit = defineEmits(['fileUploaded']);

// State
const files = ref([]);

const handleFileChange = (event) => {
  const selectedFiles = event.target.files;
  Array.from(selectedFiles).forEach((file) => uploadFile(file));
};

const handleDrop = (event) => {
  const droppedFiles = event.dataTransfer.files;
  Array.from(droppedFiles).forEach((file) => uploadFile(file));
};

const uploadFile = (file) => {
  const formData = new FormData();
  formData.append('file', file);

  // Create a new file object for tracking progress
  const fileData = { name: file.name, progress: 0 };
  files.value.push(fileData);

  axios
    .post(props.uploadUrl, formData, {
      onUploadProgress: (progressEvent) => {
        const total = progressEvent.total;
        const loaded = progressEvent.loaded;

        console.log('Total:', total, 'Loaded:', loaded); // Log for debugging

        if (total > 0) {
          const progress = Math.round((loaded * 100) / total);
          fileData.progress = progress; // Directly update progress

          // Logging for progress updates
          console.log(`File: ${file.name}, Progress: ${fileData.progress}%`);
        }
      },
    })
    .then((response) => {
      console.log('Upload successful:', response.data);
      // Mark the upload as complete
      const index = files.value.indexOf(fileData);
      if (index !== -1) {
        files.value[index] = { ...fileData, progress: 100, path: response.data.path };
      }
      emit('fileUploaded', response.data);
    })
    .catch((error) => {
      console.error('File upload failed:', error);
    });
};
</script>

<style>
.drop-zone {
  border: 2px dashed #ccc;
  padding: 20px;
  text-align: center;
  cursor: pointer;
}
.drop-zone p {
  margin: 0;
  color: #999;
}
progress {
  width: 100%;
  margin-top: 5px;
}
</style>

### Additional Steps to Diagnose the Issue

1. **Inspect Network Tab**:
– Open the browser's Developer Tools (usually F12).
– Go to the "Network" tab.
– Start the file upload and observe the network request. Ensure that the request shows the file being uploaded, and check the timing.

2. **Test with Large Files**:
– Upload larger files (e.g., 5MB or more) to ensure the upload process takes long enough to see progress.

3. **Check Backend Response**:
– Ensure your backend endpoint (`uploadUrl`) is correctly configured to accept file uploads.
– The backend should properly handle the multipart form data and respond with a valid response.

4. **Verify Axios Configuration**:
– Ensure you are using the latest version of Axios. You can check your version with:

npm list axios

– If necessary, update Axios:

npm install axios@latest

5. **Test Different Browsers**:
– Sometimes, specific browser configurations or extensions might interfere with file uploads. Test in multiple browsers to see if the behavior changes.

### Conclusion

If, after all these steps, you still cannot see incremental progress updates, it may help to temporarily simulate an upload in your backend that takes longer to process or to log the progress in more detail. Sharing your backend implementation or any additional error messages can also help pinpoint the issue.

User
still progress bar not showing like 0%, 1 % etc
Assistant
If the progress bar is still not updating incrementally (e.g., showing values like 0%, 1%, etc.) and instead jumps from 0% to 100%, we can go through a more systematic troubleshooting approach to identify and resolve the issue.

### Comprehensive Troubleshooting Steps

1. **Ensure the Axios Version**:
– Confirm that you are using a version of Axios that supports the `onUploadProgress` event. The latest versions are generally reliable, but ensure that you're using at least version 0.19.0 or later.

npm install axios@latest

2. **Testing with Larger Files**:
– Make sure to test with sufficiently large files to observe progress updates. If the file is too small, the upload may complete before progress can be captured.

3. **Modify the Backend to Delay Response**:
– Introduce a simulated delay in the backend file upload handler to ensure that the upload process takes enough time for progress updates to occur. Here’s an example of how you might simulate this in a Node.js/Express backend:

app.post('/upload', (req, res) => {
     // Simulate a delay (e.g., 5 seconds) to see progress
     setTimeout(() => {
       // Handle file upload here
       res.json({ path: 'path/to/uploaded/file' });
     }, 5000); // 5000 ms delay
   });

4. **Update the Vue Component for Debugging**:
– Enhance the debug logging within your Vue component to ensure progress is calculated and displayed correctly:

const uploadFile = (file) => {
  const formData = new FormData();
  formData.append('file', file);

  const fileData = { name: file.name, progress: 0 };
  files.value.push(fileData);

  axios
    .post(props.uploadUrl, formData, {
      onUploadProgress: (progressEvent) => {
        const total = progressEvent.total;
        const loaded = progressEvent.loaded;

        // Log total and loaded bytes for debugging
        console.log('Total:', total, 'Loaded:', loaded);

        if (total > 0) {
          // Calculate progress percentage
          const progress = Math.round((loaded * 100) / total);
          fileData.progress = progress; // Update progress
          console.log(`File: ${file.name}, Progress: ${progress}%`); // Log progress percentage
        }
      },
    })
    .then((response) => {
      console.log('Upload successful:', response.data);
      // Mark the upload as complete
      const index = files.value.indexOf(fileData);
      if (index !== -1) {
        files.value[index] = { ...fileData, progress: 100, path: response.data.path };
      }
      emit('fileUploaded', response.data);
    })
    .catch((error) => {
      console.error('File upload failed:', error);
    });
};

### Full Example of a Vue Component

Here’s the full component with all suggestions integrated:

<template>
  <div class="drop-zone" @dragover.prevent @drop.prevent="handleDrop">
    <p v-if="!files.length">{{ $t('Drag and drop files here or click to upload') }}</p>
    <p v-else>{{ $t('Upload Files') }}:</p>
    <ul>
      <li v-for="file in files" :key="file.name">
        {{ file.name }} - {{ file.progress }}%
        <progress :value="file.progress" max="100"></progress>
      </li>
    </ul>
    <input type="file" multiple @change="handleFileChange" />
  </div>
</template>

<script setup>
import { ref } from 'vue';
import axios from 'axios';

// Props
const props = defineProps({
  uploadUrl: {
    type: String,
    required: true,
  },
});

// Emits
const emit = defineEmits(['fileUploaded']);

// State
const files = ref([]);

const handleFileChange = (event) => {
  const selectedFiles = event.target.files;
  Array.from(selectedFiles).forEach((file) => uploadFile(file));
};

const handleDrop = (event) => {
  const droppedFiles = event.dataTransfer.files;
  Array.from(droppedFiles).forEach((file) => uploadFile(file));
};

const uploadFile = (file) => {
  const formData = new FormData();
  formData.append('file', file);

  const fileData = { name: file.name, progress: 0 };
  files.value.push(fileData);

  axios
    .post(props.uploadUrl, formData, {
      onUploadProgress: (progressEvent) => {
        const total = progressEvent.total;
        const loaded = progressEvent.loaded;

        // Log total and loaded bytes for debugging
        console.log('Total:', total, 'Loaded:', loaded);

        if (total > 0) {
          // Calculate progress percentage
          const progress = Math.round((loaded * 100) / total);
          fileData.progress = progress; // Update progress
          console.log(`File: ${file.name}, Progress: ${progress}%`); // Log progress percentage
        }
      },
    })
    .then((response) => {
      console.log('Upload successful:', response.data);
      const index = files.value.indexOf(fileData);
      if (index !== -1) {
        files.value[index] = { ...fileData, progress: 100, path: response.data.path };
      }
      emit('fileUploaded', response.data);
    })
    .catch((error) => {
      console.error('File upload failed:', error);
    });
};
</script>

<style>
.drop-zone {
  border: 2px dashed #ccc;
  padding: 20px;
  text-align: center;
  cursor: pointer;
}
.drop-zone p {
  margin: 0;
  color: #999;
}
progress {
  width: 100%;
  margin-top: 5px;
}
</style>

### Conclusion

1. **Testing with Large Files**: Ensure you’re using files that are large enough to see progress updates. Files under 100 KB might not show progress as they upload too quickly.

2. **Backend Simulation**: Simulate a delay on your backend to better visualize the upload progress.

3. **Inspect Network Tab**: Use the network tab in your browser’s developer tools to monitor the request and ensure data is being sent properly.

4. **Cross-Browser Testing**: If you still cannot see incremental updates, try uploading from different browsers or even from different machines to rule out local issues.

If you follow these steps and the issue persists, please provide any backend code handling the file upload to investigate further.

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