You can leave a comment on a specific time in a video or audio file on dropbox.com.
To comment on a timestamp:
All video and audio file types that can preview in Dropbox allow for comments on specific times.
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If the file belongs to someone with a Dropbox Professional, Advanced, Enterprise, or Education account, other people with those account types will be able to comment on a specific time.
If the file belongs to someone with a Dropbox Basic, Plus, Family, or Standard account, comments can only be left at :00 and the time will be grayed out.
Customers who have purchased the Dropbox Replay Add-On (formerly the Creative Tools Add-On) can also comment on specific frames of video files.