Thanks for that. So then, sorry to be a bit thick here: there is no Version History feature possible at all if using iCloud (in my case because I want the vault to be the iAwriter folder).
If you use sync only for version history on one computer only and you have iclould to sync between your mobile and your computer, it should still work fine.
Side-note: obsidian mobile is currently tested by insiders will be released in the next weeks.