I can not upload pdf file of size greater than 2 MB. When I try it says "File Not selected". I have checked attachment settings where pdf files are allowed and max file upload limit set to 30MB. I have checked my LEMP set up where File Upload limit is set to 50MB both in PHP and in Nginx. I am running 4 websites in the same linode VPS. But only with xenforo installation this 2 MB limit apply. Is there anything, I need to change from xenforo part?