Trying to import 2020 taxes and stuck at reading return pop-up

I'm using turbo tax premier on windows and am trying to import last year's 2020 file. It finds the file on my machine, but when I click transfer return, a pop-up with a circle comes up and says reading return for about 3-4 seconds and then goes away and nothing happens. The only thing I'm able to do it proceed without importing.

 

Anyone run into this/any tips on what to try? Thanks!