I find the way to resolve my problem of duplicate files

I like to use DB. Dropbox uploads any files you add to your Dropbox folder, even if those files already exist somewhere else in your Dropbox account. You may have duplicates of the same file even if the photo or video is visually identical and has the same file size and format.
Then I try many way to resolve this problem.

  1. One workaround is to move the file out of the Dropbox folder while editing it. Once you’re done editing, you can move the file back into its original location in the Dropbox folder. It will reappear with your edits for all users who have file access.
    2.Another way is use (Removed) Maximizing And Optimizing Your Dropbox’ And Device’ Space.
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