Smush Image does not work.

how to configure wp smush pro to convert uploaded PNG right to JPG
not it looks i have to "resmush" PNG image to make it work

that when i firstly upload picture and set it as featured picture in the post, then it smush the picture but it preserves the format of PNG
i can then publish post and i see that featured picture is in PNG format
then i have to go to post, click on featured picture (to see images dialog) and when i there hit "resmush" then it do the work and converts png to jpg

i now also tried to upload small png like 144x 100 PNG
Sent from App, via Chrome, 3m ago
and it is still doing this smushing but it should be like in a few seconds done, it still has this message smushing in progress

See this screenshot: