A Microsoft file hosting and synchronization service.
Hi!
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This is a known type of issue on iOS where app-to-app file access (especially between Google and Microsoft apps) breaks after updates. Since it used to work, the problem is almost certainly due to recent iPhone update.
First, you need to reconnect you OneDrive account. Open OneDrive app, once opened click your profile > Settings and sign out. Once signed out try to sign back in and restart your phone.
Once done you check again and see if OneDrive can be detected.