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What are the devices?
What filings systems (FAT, FAT32, NTFS or whatever) do they use?
You mention a "local file system", bit don't say on which device that was.
I think the original device might use something very basic with filenames like IMG_nnnnnn.jpg, and when you renamed the files on that device either the new names weren't applied at all (but it didn't tell you) or they were stored somewhere (within the image perhaps?) and the device's own file manager didn't show you that the underlying file names hadn't been changed.
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