I am Importing 2d art from Photoshop for Side scrolling game

Ok treat me like child and use small words, kind of. So a couple of you on here answered a really important question a bit ago and did a great job so I am hoping you can do the same, again.

I am trying to import 5 layers of art(foreground, mid, back and so on) into unity. I read it has to be 1024 x 1024 but I hope I am wrong. I saved it as a RAW file and I have tried to import it but it doesnt go into the editor window. I looked on youtube and cant really find much. Any help would be appreciated. I know I am learning so please bare with me.

Thank you

I would try saving it as a JPEG or a PNG file. I don’t know much about RAW files. I know you can edit the 1024x1024 scale with JPEGs and PNGs.