Can't copy a Dropbox folder to an external drive when using Mac OS

Hi Brylske, thanks for messaging the Community.

Just for clarification, are you copying the entire Dropbox folder itself, or a folder within the Dropbox folder, or are you moving the Dropbox folder using these steps?

This will help me to assist further!

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Brylske wrote:

When I try to copy a Dropbox FOLDER to a SanDisk 1TB external drive, I get the message, "The operation can’t be completed because an unexpected error occurred (error code 0)."

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Is the folder marked as Available offline, along with all of the files within it?

I keep getting messages that I'm running out of space so I'd like to reduce the number of files in DROPBOX by moving some of the oldest files (which I would not like to lose) to an external drive and deleting from DROPBOX thus leaving more space.