There shouldn't be a storage issue. FF works here but that doesn't mean much these days. It did seem to take a long time for the forum software to acknowledge the upload request.
We had an issue a couple of years ago with the attachments taking up too much server space. I had to change some forum settings and some of the attachments became disconnected from the messages they belong with. I'll try to spend some time remembering how to find them again.
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