So there is progress .
After the third installation of paneldue software finally I have thumbnails .
But the strange thing is that I had to install the version with the logo , and only appeared thumbnails later after returning to the software without the logo that was originally still there . From my point of view , flash cleaning does not work or causes problems and some garbage remains. I once had a similar problem with ESP8266 and had to upload Blank.bin to erase the flash.
And now the question is do you have plans to add a thumbnail display on the Status panel when printing?
Greetings ...