Change a file extension in iOS 13
How do you change the extension of a file in ios 13 using the file app?
iPhone XS
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You can’t, because the file extension identifies the app that “owns” the file. If you changed the extension the file could no longer be opened. You can change it on a Mac by going to iCloud in Finder, but if you do it might no longer appear on your phone. I think you can with iCloud for Windows also, but as I don’t have iCloud for Windows I can’t check.