Trying to click post button after video upload (.mp4) on X gives message "Your video file could not be processed."

[sachi-gkp]

Describe the bug Trying to click post button after video upload (.mp4) on X gives message "Your video file could not be processed."

To Reproduce Steps to reproduce the behavior:

1. Go to 'https://x.com/home'
2. Click on 'Post'
3. Attach Media file
4. Click Post button

Environment Mac OS Sequoia v15.5 Firefox Version 140.0.4, Build ID 20250707120347

HAR file x.com_live_pipeline_events_Archive [25-07-21 14-14-09].har.zip

[jibal]

This is the wrong place for that.