Problem with Before/after

[LARMINIERJULIEN]

Hi everyone, i've problem in the modules developpement with before and after. 
I'm in LR 2020. 
when i try to look my picture before my modification, i can see my picture before but after doesn't appear. 
But when i change the way of Before/after it's working but i don't like this screen. 
Some one can help me? 
Thanks a lot.

[LARMINIERJULIEN]

So, My bad. 

But i've find the problem but how to solved it? 
we can't view before and after with a picture export from Photoshop. 
It was a .PSD .