Thank you for your reply. I am curious that if the server limit is 64 mb, why am I allowed 800 mb in the base WPForo but not Advanced Attachments?

Thank you Alvina. I understand the difference between MB and KB. I have raised the max upload size in WP Foro to 800 MB.I cannot raise the max uploa...

Advanced Attachments option  Advanced-Attachments.png