Can steam friends join sessions in non-steam game?

Hey, is it possible to use the Advanced Sessions plugin to connect to steam and have friends join created sessions using steam without uploading the game to steam?

For example, if I upload a game with the Advanced Sessions plugin working to and have my friends download the game from, can they send and receive invites to sessions through steam?

If you want to use steamworks in production, you will need an id, which you will only receive after a project review.
You can find more information about the review process here: Review Process (Steamworks Documentation)

But you can use the development global id (480) and run steamworks from anywhere, even if the game is not packaged yet. There shall be limitations about the use of this id, but I guess it will work very well for sessions finding.