Substance Sampler 8k export problem

[caner0D4D]

I made material using substance designer. I magnified 3 times. I can export 8k from substance alchemist. But, Since I switched to substance sampler, I can't export 8k. I don't know exactly why. No rendering at 8k resolution. substance alchemist was all happening. I will be glad if you help. I tell you what I mean in the photos