Failed uploading

So I set up a site a few weeks ago, where I wanted users to be able to post attachments as guest. I did not pay for the minimum storage, although it said that I had 20gb of storage space free. I set the attachment size to 20gb in my settings, though it still doesn't let us post attachments

Help?

~Zeuss

Have you seen this?
https://help.forumotion.com/t66572-attachments

I have seen that thread. I read it all. But it still doesn't really help me.