Photos import or OneDrive creates _fall_back files
When I import pictures from a USB device (Android phone), numerous additional files are created with file names with the prefix _fall_back After ticket 1682415 with OneDrive support and ticket 1489401937 with Windows 10 support, I am no further forward. If there is anyone from Photos or OneDrive who recognizes this file name and can identify why thousands of such files are being created then please reply.