Open Files and tap Browse until you see Locations. Expand Locations if the list is collapsed. If iCloud Drive is hidden, turn it back on under Browse > More > Edit. If the option is missing, check Settings > your name > iCloud > Drive > Sync this iPhone.
01Go back to the list of locations
Section linkTap Browse at the bottom of Files. If it opens inside a folder, tap Browse again to return to the list of locations. Under Locations, tap iCloud Drive. If Drive is missing from the list, tap More at the top of Browse, then Edit or Edit Sidebar. If iCloud Drive appears with its switch off, turn it on.
02Check Drive on this iPhone
Section linkOpen Settings, tap your name, then choose iCloud > Drive. Turn on Sync this iPhone and return to Files > Browse. If you expect to see the same files as on another device, confirm both devices use the same Apple Account. On a Mac, check the iCloud Drive location in Finder for a file you recognize.
03If the location is there but a file is missing
Section linkSearch for its name in Files and check where the app saved it. On My iPhone holds local files, while iCloud Drive holds files saved to the cloud drive. For a download, check Downloads under iCloud Drive and the local folders if needed. For a photo from your library, start in Photos. Confirm you can open a cloud document you recognize before moving or deleting any copies.
Sources & further reading
Put it into practice
Before you convert
A short checklist for choosing an image format and checking the result.
Download checklist (.txt)