@lmx Good question. I am unsure whether ACP->Settings->Uploads affects url images. I think it does but been a while since I tweaked those knobs.... 🤔
Have you tried/tested any of those that relate to images?
It does not resize images.
version: 1.1.0
@pikshub fixed on master https://github.com/NodeBB/NodeBB/pull/4864