You can do much more with paint.net than with Paint. You can add layers, adjust colors or remove certain areas of the image with the eraser tool to make the PNG transparent. In GIMP, click on “Layer” ...
I AM no stranger to tablets but the Samsung Galaxy Tab S10+ is the first one I have used with 12.4 inches for the display and it’s quite large. But the reward of using one that large is that amazing ...