[GNC] Message from GnuCash about Dropbox

[David Long]

Hi
My GNucash files are saved on a folder which is synchronised with Dropbox.
I keep getting a message:
"Remove "{file name}.tmp-a24500" from your Dropbox account and all devices?
If you move this file to "$Deleted$, it won;t be available in Dropbox or on
any devices"
 Cancel  or Move out of Dropbox

I click on Cancel.

What is all this about? Is there a problem with saving on a folder which
synchronizes with Dropbox?

thanks

David Long