I'm super new to game development. I'm sorry if the answer is obvious. I looked in the documentation and didn't find anything.

I'm trying to import the tilesets I made into GameMaker. GameMaker is not cooperating.

On the home screen, I clicked the "Import" button on the "File" menu. It filters my files by "Supported filetypes" and the files I'm looking for aren't showing up.

It's possible that GameMaker might think I'm trying to import a game file. Does GameMaker do that? If so, where do I go to import assets?

It's also possible that GameMaker might not like PNG format. If so, which formats does GameMaker accept?

Thank you so much for your help!

Edit: I figured it out. You drag and drop the image from another window.