Anonymous Post doesn’t generate thumbnails

Hello,

I would like to say this is a great plugin. I don’t know if I missed something in the settings or what I’m requesting is not a feature. However, once I upload a post with images it doesn’t generate a thumbnail image but just resizes 1920 x 1080 to the dimesons I have forced via CSS. I was wondering if someone could assist with this issue?

The page I need help with: [log in to see the link]