I'm trying to move my Dropbox contents from my Macbook's local storage to an external RAID (Lacie 6Big Thunderbolt 3). Overnight I was able to copy the contents of the dropbox folder across to the RAID by changing the "Dropbox Folder Location" in sync settings. The files moved across ok although Dropbox suggests it still needs to sync these files - "Syncing 250,724 files". This number isn't moving. Is there something I should have done differently in order to set this up?

Note: I understand the risks using Dropbox with an external drive and have set up an automation to close Dropbox prior to ejecting the harddrive.