Here is the list of files that cannot be moved, backed up, or synchronized from Dropbox:

Dropbox papers Dropbox doesn’t allow us to export Dropbox paper (.paper files) and Dropbox paper templates (.paper files).
Dropbox & Dropbox Paper getting started instruction files These files can cause Dropbox API download failures and are ignored.
URL hyperlink files Dropbox doesn’t allow us to download URL hyperlink files that end with .url or .web.
Google files shortcuts (gdoc/gslides/gsheet) in Dropbox Dropbox doesn’t allow us to download Google files.
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