Do I keep textures made in blender when exporting obj to roblox studio?

I have a object in blender with a pbr texture on it, when i export it to roblox studio does it keep the texture?

it won’t unless you have bake the textures

Unfortunately, no it does not keep the texture. AS another comment said you will have to bake it which can be a very annoying process. To my knowledge the baking method allows you to export normal colors but if you added materials it will not export that. If you want to know how to bake your creation look at this video.