I'm having the same issue and there still isn't a solution from Samsung? Really? My pictures saved on my 64gb micro SD card are randomly inaccessible which is inconvenient to say the least. Especially when trying to share photos with family members I only get to see once in awhile that aren't technologically inclined (they're quite old.) I've tried wiping the system cache, formatting my SD card, swapping SD cards, restoring my S9 to factory settings... nothing works.
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