>>>...I have no clue how to share .dwgs...<<<
Come to the website where you posted (here is the link https://forums.autodesk.com/t5/autocad-forum/can-t-join-and-or-union-regions/m-p/10353856#M1053531 ), click on REPLY button, file attachments are below the text box.

Or use your own OneDrive Account (free for every Windows user on the planet) or your DropBox account if you have and prefer to use it, to share files.

TIA