I tried Drobbox now, and I specifically tested it with a 36MB File not downloaded in Dropbox app (i.e. it has the cloud symbol next to the filename).
You can clearly see how the file is first downloaded, and only after finishing it is ready and the file is readable and usable. Therefore Dropbox works just fine.
What I do not know: Who downloads the file, Dropbox or UIDocumentPickerViewController?
Gregor202020
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Yes, iCloud Drive workes fine. I did not test it with Dropbox though...
Unfortunately this did not work in my project...any other suggestions are welcome!
I introduced an error in my code and prepared a feedback: FB9705803