“Apple’s Files app solves mostly solves that for me.“
It’s better but it’s still riddled with arbitrary restrictions. For example when I want to watch a MKV video in iCloud I have to copy the file from iCloud to the folder of the player, then delete. Can’t open iCloud files directly with the player and can’t move either.
On the bright side I am confident by 2025 in iOS we will have the same functionality we had already thirty years ago... with the exception that every piece of software will be charged with the 30% Apple tax.