I had the same frustration, but I have found a perfect solution: A simple app called "DSC Auto Rename" by Ciubex https://play.google.com/store/apps/details?id=ro.ciubex.dscautorename Works perfect! Save your pictures to your internal memory, because once on the external, it can't change anything anymore. What a wonderfull latest Android update (not!!). After the app has changed the name (I set it to 3 seconds) to the exif information-name, I move my pictures to external.
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