Videos not working

I’m relatively new to Unity and I’m having a problem with videos.

Whenever I put videos in Unity everything works and when I build it everything works. But when I send the build to others, the video files don’t load.

Error: WindowsMediaFoundation received empty file C:/users/_____/Download/klapp du stück-20231003T195213Z-001/kalpp du stück/Mia_s Sketchbook_Data/sharedassets0.ressource

How can I fix this?