Deleting uploaded files

The forum allows us to upload up to 2 MB of files with our postings. I thought that was 2 MB for each file. When I reached the 2 MB limit, I was notified. I then deleted some of the larger files and tried to upload smaller ones. Apparently, the website remembers because now I can't even upload a single 200 kB attachment! How do I clear my area?

Thanks.

David