on 1.12.2 I have not had any problems with running shaders and mods at once but with 1.13.2 I can't seem to get it to work, on 1.12.2 I would just have to install optifine and then I would place it in my mods folder (just in case) but now when I do such it gives me the "not a valid mod" prompt. Is there anything blatantly obvious that I'm missing or is the combination of the two not ready yet?