I leave the thread below for how I worked out the problem. The only relation to duplicate files seems to be that it presents with this error.
Specifically, starting with a freshly updated Ventura Mac and a fresh install of Monument desktop app version 1.3.0. Drag and drop two new photos to the app upload window and submit, with affirmative messages 2 files uploaded OK. Inspect photos on Monument, only one photo has been loaded into database. Subsequent attempts to submit missing photo through desktop app are rejected as duplicates. Put missing photo on SD card, photo will upload.
This is a bug, causing users to lose images.
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Provide more control over how files are detected as duplicates. I have a photo that won't upload as 'duplicate detected' - same filename, camera, probably size etc. exists in database but wildly different content, date, location and other exif info. I see other filename duplicates from same camera handled ok (2 photos), but this is obviously disconcerting as may not have noticed before.
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Please, as you've not released any updates for almost 9 months now, how about open-sourcing your software so that your customers who invested both time and money in the product might be able to get a working system on their own?