I have the same issue with Colorsoft—I've tried running Calibre in debug mode, this is a (potentially) relevant bit from the logs:
Failed to upload cover thumbnail to system/thumbnails with error: Failed to create folder named system in ('Internal Storage',) with error: 2:PTP Layer error 200d: LIBMTP_Create_Folder: Could not send object info.
I'm running Calibre 7.20 on macOS Sonoma (14.5).
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