> ## Documentation Index
> Fetch the complete documentation index at: https://docs.listenlabs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# File Upload Questions

> Add a file upload question, set its limits, and add an optional reference check.

A file upload question asks each participant for one file, such as a photo or a PDF. Use the optional reference check to compare each upload with reference images.

## Add a file upload question

1. In the study editor, click **Add Question**.
2. Click **File upload**.
3. Click **Expected file content** and describe what the file should show. The interviewer uses this text.

## Limits

* Each participant uploads one file per question.
* The maximum file size is 40 MB.
* Accepted types are images (JPG, PNG, GIF, WEBP, HEIC), videos (MP4, MOV, WEBM, M4V, AVI), PDF, DOC, DOCX, PPTX, XLSX, CSV, TXT, JSON, and HTML.

## Add a reference check

1. Under the question, click **Reference check**.
2. Type your criteria in **Criteria (required)**. The check runs only when this field has text.
3. Under **Reference images (optional)**, click **Click or drag media here to upload**. Add up to 5 images.

The check sends the upload, the criteria, and the reference images to a model. It returns one verdict: **Match**, **Partial match**, **No match**, or **Unclear**.

* The check reads images, PDF, DOCX, PPTX, XLSX, TXT, CSV, HTML, and JSON files. It does not check videos or DOC files.
* If a reference image fails to load, no verdict is saved.
* A **No match** verdict sets the response's quality rating to **To Review**. **Partial match** and **Unclear** do not change the rating. For what **To Review** means for panel responses, see [Fraud Prevention & Response Quality](https://docs.listenlabs.com/setup-to-launch/fraud-prevention-and-quality-guard.md).

## What participants see

Participants do not see the verdict. The upload is accepted, and the interview continues.

## Where researchers see uploads

* **Responses** page: open a response to see the **Uploaded file** preview. Click **Download** to save the file.
* **Responses** page: the reference check verdict appears under the upload, and in a column named **Q\[number]: Reference check**.
* Question analysis: each upload row has a **Download** button. Click **Export all** to download every file.

## Screeners

You cannot add a file upload question to a screener.


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