problem with export

I’m a game developer for android and I’m doing a 3D games but I have a problem with export file from blender.
I donwload from internet a 3d model in .Iwo format and I need for my game to convert it in obj format.
The problem is that I know how to export in obj but I also need with the obj file the png (texture) file.
How can I get this last one?
thank you

You can go to ‘File’ and click on ‘Append’ then go to wherever that model is, you don’t have to worry about
textures as it will go with the object file.