To edit videos or images on CapCut Online, you need to turn on WebGL.
Click this link, and if you don’t see a spinning cube, it means that you haven’t turned on WebGL in your browser.
Follow the instructions below to turn on WebGL:

1. Update your Firefox to the latest version.

2. Enter and visit “about:config” in the address bar. If you see the “Proceed with Caution” page, click “Accept the Risk and Continue”.

3. Search “webgl.force-enabled”. Then select “true”.

4. Search “webgl.disabled”. Then select “false”.

5. Restart Firefox and open CapCut Online.

If the problem happens again after you take the steps above, you may not be able to use CapCut Online on your device. Try another device and open CapCut Online in the latest version of Google Chrome.