LR no longer "finds" images in my dropbox
I am running LR Classiv v12.1 on a Macbook Pro with Monterey 12.6.2.
My catalog and photos are all in my dropbox and I have an external backup drive which backs everything up.
The problem (now that I have finally spent some time analysing it), testing old catalogues and backups ... etc
For some time I have noticed that LR cannot find many of my old JPG (and sometimes DNGs) files - the "!" appears in LR, and despite trying different options to find/re-import them, the issue persists.
If I go to the source file in my dropbox via Finder, or on my external backup drive, and try to open the file, the error "The file "IMG_nnnn.JPG" could not be opened" appears so I don't believe the problem is with LR.
However, if I go to dropbox.com and download the file, import it into LR, there is no error and the image is visible in LR.
Which I think leaves me with 2 options ... for which I am seeking some advice.
1. Do I go to dropbox.com and download all my JPGs and import them again into LR
or
2. in LR set my source files to dropbox.com, rather than via Finder - if that's even possible ???
If anyone has any suggestions I would be super grateful !!
