to make surface textures

• insert file into Simplerockets2 > UserData > CelestialDatabase > SupportFiles
• if the simplerockets2 app is open, close it, and also close the files app
• launch simplerockets2 (app) and add the texture into a planet's texture index

to make ring textures

• insert file into Simplerockets2 > UserData > CelestialDatabase > SupportFiles
• the file must have a transparent background, and the rings must be vertical
• if the simplerockets2 app is open, close it, and also close the files app
• launch simplerockets2 (app) and add the texture in the rings tab in planet studio

You need to copy the texture into SupportFiles, it might different for other device but for Android it goes 'Data > Android > com.jundroo.Simplerockets2 > files > UserData > CelestialDatabase > SupportFiles'. the other easier way is to download other planet with custom texture in it.

You don't.

;)

Jk, but I'm not sure exactly how. I believe you have to manually add it to the game files, so be careful if you do. I've never bothered trying any of that though, so idk