Question "keep alpha" option is grayed out in import .webm video settings

You can find docs on all the settings here https://docs.unity3d.com/Manual/class-VideoClip.html

But to answer your question, the option is grayed out because our importer can't see alpha in your video so there is no point to choose to keep it. Can you confirm whether your file contains an alpha channel or not? Try these steps to see if the issue is from your file or a bug in our importer. https://stackoverflow.com/questions...alpha-channel-in-a-video-using-ffmpeg-ffprobe