Unable to upload new images in a created Visual Question Answering task

[c-x-z]

Describe the bug Unable to upload a new image in a created VQA task, the following appears when uploading an image:

[0daf5e7a-bba8-4a2a-a6b2-a2d2ea423ab8] Validation error (Failed to parse input file upload/20/b95b6c59-00005.jpg: [ErrorDetail(string='Your label config has more than one data key and direct file upload supports only one data key. To import data with multiple data keys, use a JSON or CSV file.', code='invalid')])

What do I have to do to fix it?

To Reproduce Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• OS: [e.g. iOS]
• Label Studio Version [e.g. 0.8.0]

Additional context Add any other context about the problem here.

[gabrielqr]

do we know how solve it or not yet?

[gilberthtg]

The error occurs because in Label Studio, when we upload an image directly (drag & drop or file upload), there can only be one data key in the labeling configuration.

👉 What this means is that in the label config (XML setup for the project), there can be more than one <Image value="..."> or <Data value="..."> element. Incorrect example (having more than one key):

<View>
<Image name="img1" value="$image"/>
<Image name="img2" value="$image2"/>
</View>

If you use direct upload, it doesn't work, because Label Studio is confused about which data field to use (image or image2).

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Solution:

1. If you only want one image per task:

Make sure there is only one data key in the configuration, for example:

<View>
<Image name="image" value="$image"/>
<Choices name="label" toName="image">
<Choice value="Cat"/>
<Choice value="Dog"/>
</Choices>
</View>

Then upload the image directly to the project.

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2. If you need multiple data keys (e.g., image + text, or two images at once):

You cannot use direct file upload. You must use JSON/CSV import. Example JSON format:

[
{
"image": "https://example.com/image1.jpg",
"image2": "https://example.com/image2.jpg"
}
]

Or CSV:

image,image2
https://example.com/image1.jpg,https://example.com/image2.jpg

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⚡ So the bottom line:

• Direct upload → only 1 <Image> or data key.
• Multiple data keys → use JSON/CSV import.

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