Does Scrivener have a mobile version?

Does Scriveneer 3 have a mobile version? It would be great to have one so that one can jot down notes (read ideas!), which appear suddenly, while on the move.

No, but you can set up an external sync folder that syncs addition to the files in there into Scrivener on startup.

Any text editor on mobile could be used to add and edit files, like notes and ideas.

Well, there’s Scrivener for iOS / iPadOS. But not for Android.