When mixed media files extension names are changed to the wrong media/format. I have MPV, DNG, NEF, JPG, HEIC, WAV files in one folder. I sort them chronologically. then I build a name protocol of three line elements to from YYYYMMDD-AA-BBB-XXXX. In the past, it left the extension name alone. Now many will hfe their extension switch to one of the other formats present in the folder.
.NEF BECOMES .MOV, .MOV BECOMES .NEF, DNG BECOMES MOV, .MOV BECOMES .WAV.

IT IS VERY TIME CONSUMING TO FIX THESE ERRORS. (CHECKING METADATA AND LIKELY FILE SIZE TO MANUALLY RENAME THE EXTENSION NAME.

MBP 15-inch,2017, Mojave 10.14.6, mov and nef file formats are not allowed to be uploaded. Bridge 2021