A Microsoft file hosting and synchronization service.
Hi FranciscoBombella,
I'm Sneha and I'd be happy to help you out with your question.
OneDrive is treating your Camera Roll Images as Files because iPhone 13 Pro latest update turns on photos optimization for iCloud by which the file type or consideration is modified/optimized as per iCloud. To have those photos considered as photos in OneDrive you'll need to To disable optimization, To do that tap Settings > iCloud > Photos and uncheck Optimize Storage.
Those too many files are not unknown files, they are your Camera Roll photos and in details they are displayed as File instead of Photos format because they are "Optimized Photos with respect to iCloud and only iCloud can consider files(photos) optimized for it as Photos" Unlike Google Photos, One Drive backed up your Camera Roll optimized photos as files because it scan and upload all type of files from storage paths it's set to upload where as Google Photos reject "files which are not photos or videos" because Google Photos are set to backup only Photos and Videos formats where as Optimized Photos in iPhones specially from Camera Roll are converted as Files after optimization but you can access share or edit those Optimized Photos files within iOS because it's coded in the way that it re-convert or change the Optimized files to the original file format they are required to share but when it comes to back specially auto backup when iPhone do not recognize Auto Backup as Sharing it do not convert the Optimized Photos Files to normal Photos format and OneDrive backup those Optimized Photos file after Scanning as there desired paths are set to take backup from.
I hope this information helps. If you have any questions, please let me know and be glad to assist you further.
Give back to the Community. Help the next person who has this issue by indicating if this reply solved your problem. Click Yes or No below.
Best Regards,
Sneha