Smugmug doesn't interpret Video Timestamps correctly
I'm having a similar issue with video files from both my iPhone (uploaded from the Smugmug app) and video files from my Nikon Z 6II.
Both handle timezones differently in their metadata, and Smugmug interprets both incorrectly, causing files to be out of sort when sorting by Date Taken.
Here, the time the video was taken was 11:03pm locally. Smugmug interprets this as hours before, placing videos sooner in sort order than they should be.
For Nikon Z 6II files, macOS interprets the file correctly as taken at 5:34pm:
...but Smugmug uses the UTC time, placing it 4 hours into the future.