Can you please file an inquiry ticket here and our support team will gather some additional information to assist you in resolving this issue.
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After moving my Dropbox sync folder and dj library to a new SSD on my computer rekordbox no longer seems to want to talk with Dropbox. 
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Can you please file an inquiry ticket here and our support team will gather some additional information to assist you in resolving this issue.
make sure that the Dropbox app is signed in and running
then Enable CloudSync, which will then recognize Dropbox