Mirr.io — Sketch to prototype in seconds

Well, this was promising. I started to link and select transitions in Sketch and I was very happy but... Then I want to see my prototype. I clicked "view in mirr.io", waited for 30 minutes and nothing happened. I tried anything, dragged and dropped into app etc. Nothing.

Wow — this is super cool!

Has anyone used this product for making mocks? Any more reviews than what was posted a month ago?