Alright, sometimes when I save my picture as PNG, it is stuck at "finishing". Look here, I'm not very good at explaining: The "finishing" thing.
Every time, I need to shut down my laptop to make Paint.NET stop being stuck at that, but I need to edit the picture again from the last saved version of it.
If I save it as JPEG, then it will lose quality.
Many people who make videos such as mapping (where you need to make about 100 PNG slides to make a video) with Paint.NET have the same problem as me.
Thank you for reading.