Use Aseprite's File menu to convert the graphic to a more common format like PNG. More Information on ASE Files To create ASE files in an Adobe program, just find the same menu in theSwatchespalette that's used to open the file, but choose the save option instead. In Photoshop, it's...
Granted the software does cost money so unfortunately it’s not free & open source. But if you want to learn Aseprite you can do sofor freewith YouTube at your side. I specifically recommendthis videoon animating in Aseprite. It’s pretty short but covers a lot of what you’d need to...