I have been using this plugin on 4.11 and it is great attaching to my screen, because I have a MKS TFT35 LCD, a picture of the sliced STL I have done. I have really enjoyed this because It makes it faster to identify the print I want to do. I upgraded to 4.13, it has the plugin but it does not display the print on the screen. I did not upgrade to 4.12.1. I skipped it but did have in available to play with. Did not do a single print.
At this point unless someone can help me with my problem, I am going back to 4.11.