I can’t open any file on my iPhone
iPhone 11 Pro, iOS 17
Either you have logged out from iCloud Drive on your device or yet to Set up iCloud Drive on your iPhone.
If you had those files on other Cloud Drives (Google Drive, OneDrive, DropBox, Flickr, box, AmazonDrive, Adobe Creative Cloud etc) Then please log into them before you can access those files on Files App.
Ensure that the server that is hosting the Drives is up and active. --> https://downdetector.in/