Video files is not uploading in saved style

Hello Figma friends!
I couldn’t find anything in the forum. Maybe someone has an answer.
I have saved styles for different backgrounds that are made up of several layers.

  • at the bottom is a video
  • above an overlay with 60 % opacity
  • and then a gradient

If I now want to change the video in this style and upload a new one, I can select a file via the Finder but it is not uploaded - nothing happens.
But this only happens in a saved style. Otherwise, uploading the videos works perfectly.

Does anyone have any advice?