There are posts which I've turned into PDF's, where you can download from my math group:
And I try to say there when a post has a PDF attached.
You can also comment there though it has been a very quiet spot. Not a big deal. Have had it for some years, where its primary purpose is for later, so for instance, if someone thinks he's found something mathematically important which he wants to show me, I'd refer him to post on my math group.
I have no intention of ever considering math ideas presented to me by others as, well, I'm not a mathematician. However, I can provide a forum.