Cannot save file in Xd

I've been working with Xd for about 25minutes. Then out of the blue (while changing some gradients), Xd has crashed. My recovery file opened where it crashed, but I cannot save it in any way. When I try to close the program, I hit "save" on the modal window and nothing happens. What in the hell is this?!

Secondly, when Xd crashed in the past and it recovered my file, when I'm trying to save it it again, Xd forces me to create a new file, instead of just saving to the old one! That means - new design links EVERY TIME!!! How in the world someone in the UX team came to conclusion this is a logical choice?! Guys, seriously, fix your software instead of adding new features.

The amount of crashes and performance issues for the last year is pure downhill. I literally cannot use this software for longer then 30 minuteswithout some form of issues. I'm literally on the edge now.