I have an app that needs a significant READ-ONLY database… Can I use XOJO desktop to create the database, schemas and populate the tables, and then just drag that database file into an iOS project? Is there an issue (maybe not now, but later) with the version of SQLite on the Desktop, and that on iOS being in-compatible at some level?

I “assume” that XOJO updates/replaces the SQL engine on the desktop when required … but do they do that for the “i” device? or does Apple control that via iOS updates?

should all work fine. SQLite is compatible with different 3.x versions without problems.