MP4 upload from Windows Snipping Tool rejected in Kiwi TCMS v15.1 ("File contains forbidden tag: <rt>")

[snalliah]

Description of problem

After upgrading to Kiwi TCMS v15.1, uploading an .mp4 file recorded using the Windows Snipping Tool fails with the following error: File contains forbidden tag:
The same MP4 uploads successfully in Kiwi TCMS v15.0.

Version or commit hash (if applicable)

v15.1

Steps to Reproduce

1. Record a short screen capture using the Windows Snipping Tool on Windows 11.
2. Save it as an MP4 file.
3. In Kiwi TCMS v15.1, try to upload the file as an attachment (e.g., under a Test Case or Test Execution).
4. Observe the error message: “File contains forbidden tag: ”.

Actual results

Upload is blocked because Kiwi’s sanitizer detects <rt> in the MP4 header, even though it’s valid binary data.

Expected results

MP4 files recorded using the Snipping Tool should upload successfully.

Environment

• Kiwi TCMS v15.1 (Docker)
• Works fine in v15.0
• Browser: Chrome 141 / Windows 11

Notes

This affects QA teams that rely on the Snipping Tool for screen recordings.
Temporary workaround: zip the MP4 before uploading.