as far as I know, dropbox is just a storage place for files, there would be no point in creating a bbcode to show the download link to a file. If the file happens to be a video file, you can only give a download link, not a link that will play the video using bbcode. that would require the server to be able to stream the video and as VEG said, dropbox does not stream videos etc. , it only stores the files for download/sharing etc.
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