dropbox err sync stuck in downloading pathtodir

dropbox err sync stuck in downloading pathtodir
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To dropbox linux client, it cannot get syncing detail like mac and windows, if syncing files count > 1, dropbox status only show "downloading n files" so I use following solution:

reason:

It only occurs in my unity3d project, I don't know why

in short:

create empty dirs for downloading files will fix

**for det
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