I opened an Acrobat form from a local Dropbox folder that is shared with my paralegal and tried to re-save the unmodified file in the same folder with a different name. This is the error message I got. I am a sole practitioner. Nobody else has this file open. It is also not marked with any security so I know it’s not read-only.

The only way I can save this file is to back thru the Dropbox (Personal) folder, navigate back to the subdirectory, and perform the Save As OR save it to my desktop and then move it into the right folder with File Explorer.
This only started about a month ago, and it is maddening. I figure it was either Adobe or Microsoft doing something they thought was cute with an added layer of security. Am I alone with this problem?