As an Olympus shooter this is good to know.
But good gravy that troubleshooting path got expensive real fast. Replacing the laptop and the camera? Why not start by trying something other than Photos? It doesn’t even need to be a paid product; the Olympus software is free not to mention a good baseline since it - of all the applications - should be able to import photos without corrupting them.
Edit to add: delete on import seems pretty risky. My workflow is to import and only delete from the camera after 1) the imported photos are backed up 2) I’ve done a first pass culling.
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