Invalid MIME type on some videos after changing storage URL

[rjcommanddfo]

Recently changed cloud storage providers (AWS -> MS Azure) for videos used in a BIIGLE project. For each volume in the project, I simply updated the URL to point to the new file location, which worked great for 99% of videos (annotations preserved, files playable, etc.). However, for 3/7 videos in a single volume I now receive the error:
The video MIME type is invalid. Allowed MIME types: video/mpeg, video/mp4, video/quicktime, video/webm, video/3gpp.

I'm not sure if this is a BIIGLE bug or a storage system bug (MIME type in our storage says video/mp4)? I'm curious if/how 3/7 videos in a volume could end up with a different reported MIME type before and after changing the URL? 🤔 (Possibly related to #501? 🤷)

Thanks in advance!