First of all i want to encourage author of this plugin to develop it further, because this is really valuable thing. For days I was looking for something up to date and working, and this plugin looks as it might be exactly what I need.
I dont know if anyone has the same problem as me, but generated htaccess file is all messed up. Links inside are missing endpoints and beginning of a link. for example: http://artpitorg.media.library./test/$1 [QSA,L] as you can see it only shows bucket name i entered. This happens because database table named asssu_endpoints is empty. Why? I dont know... I have tested it on two separate versions of wordpress.
Maybe developer of this plugin could look into this... I need this plugin really badly.