Nope, mine is an A series with only One UI Core, so that might be part of the problem. I don't get an option other than the few built in ones, and I no longer get the pop-up asking which app to pick a sound like before, and yes, ES File Explorer 3.x is installed.
When I upgrade to a Z Flip next year, maybe that won't be an issue anymore? I'd love to have my Whistle tone back as well as the Over The Horizon ringtone from the SII. I've never used the ringtones folders, I just assumed they were old throwbacks to early Android and no longer used. I often just up and delete those folders to de-clutter the file structure a bit. I always placed the sounds in Downloads with the rest of the files and APKs, and expected it to just ask me which app to choose tone with. Since I no longer get that, all I'm presented with are the built-in sounds Samsung includes. No + option or anything. Not even a way to download some from Galaxy Store.