Hi @atopouzian
What exactly is the issue? How do you know its not uploaded?
You are not trying to watch the video via the website are you? If so that only provides a time limited preview of the file (see https://help.dropbox.com/view-edit/video-length). Note that if it wasnt fully uploaded it wouldnt preview at all - or be playable anywhere which makes me suspect it is uploaded and you are trying to watch a preview of it.
Thank you! Yes, it does preview - just assumed since it was a 6 hr video and only could watch 3 hrs that the rest didnt upload. 🙂