The file naming convention for motion photos taken with a Pixel Phone follows this standard format:
PXL_YYYYMMDD_somenumber.MP.jpg
PXL_YYYYMMDD_somenumber.MP
It seems that the browser is dropping the .jpg extension, leaving only .MP.

Interestingly, if I manually add a 4 to the .MP file (e.g., .MP4), it displays a video clip in File Explorer.

How can I "merge" these .MP files with their corresponding .MP.jpg originals?
Alternatively, is there a way to move these files (and similar leftovers) to the ALL_PHOTOS folder automatically?

I've also noticed other file types that weren't moved, including:
.dng, .MP, .HEIC, .heif, .mov, .mp4, .jpeg, and .jpg

Is there a way to select and manage more file extensions during this process?

Thanks!