I just finished the not-so pleasant task of upgrading from version 5.5 to version 7.2 (after upgrading to 6.5.5). I have everything working except for attachments.

I can upload attachments with no problem, and they do get uploaded. However, the files are being renamed with the number instead of being prefixed. For example, instead of help-file.pdf becoming 423-help-file.pdf, it simply becomes 423.pdf. I can't figure out why this is happening.

On a related note, none of my attachments from before the upgrade show up in posts. The word "Attachment" shows up in the posts but there is no link to the files. All my attachments reside in the attachment directory - I just can't figure out why the links to them in the posts are gone.

Any help would be appreciated, as I'm at a loss.