I cannot find the autosaved files on my Mac either. Nor can I find a recovered files folder (And why are we calling them “recovered files” now when the preferences options still calls it Auto-save?) I found this link and it has me even more confused SketchUp Pro 2019 = Let's talk about Saving.
I just messed up my model. In previous versions I could go to the backup (or was it autosave then?) made 5 minutes ago. If I recall correctly, this was stored in the same folder as the .skp file but with the ~.skp extension. I still have the ~.skp files, but they’re backups now (I think) since they are much older than 5 minutes. In previous versions the Autosaves were distinct because they had the prefix “Autosave” and only were created upon crashes.
I tried going to the welcome window and restoring the "most recent’ version, but that was about an hour old! Where did that come from–the ~.skp version? (Shame on SU for not putting a time stamp on the file in the welcome window). It’s also odd that there’s an Autosave folder in User/Library/Application support/Sketchup 2019/Sketchup/Autosave. But it’s empty. I’ve lost an hour of work, and another hour searching for where my every 5 minute auto-saves are. HELP! Something is nuts–is it me?