Videos on Drive

Some users report Videos uploaded from Drive and embedded in their Site do not play, particularly if not signed in to a Google Account. This seems to be a common issue for Google Drive users. It does not seem to be a Google Sites embedding specific issue but a more general Google Drive issue.

A quick search yields a lot of reports and potential solutions.

https://www.google.com/search?safe=strict&rlz=1C1CHBF_en-GBGB804GB804&sxsrf=ALeKk03YUwYl9cJybR21eCx_G05YOhCSVg:1592940127845&q=google+drive+couldn%27t+preview+file+video&sa=X&ved=2ahUKEwi_xd-z1JjqAhXJVsAKHVfZArIQ1QIoAHoECAwQAQ&biw=1536&bih=762

I was having this problem myself using Chrome and I discovered that by going to chrome://settings/content/cookies and click the 'Add' button next to 'Allow'adding [*.]google.com to 'Allow' fixed the problem for me.

Until Google Drive fix this issue, I think Sites users are better advised to upload their videos to Youtube or Vimeo and embed from there. 

**** UPDATE Oct 2024 ****
Hopefully the new Google Drive video player described here https://workspaceupdates.googleblog.com/2024/10/modern-video-player-in-google-drive.html will resolve these issues. See also https://workspaceupdates.googleblog.com/2024/10/modern-video-player-in-google-drive.html especially the part:
"Tip: To play videos in Drive, you need to turn on third-party cookies. Learn how to turn cookies on and off. "