Unable to delete or edit attached files

I could edit the message but not the attached files.
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What is the thread?
I need to remove the first and second attachment. Wrong camshaft number.
Found it - can't delete the attachments either (?). Something that needs to be looked-into...
http://forum.hetclub.org/discussion/166655/306344-camshaft-just-profiled#latest
(Maybe Aaron has noticed this problem and fixed it, thus the appearance of the DELETE option all of a sudden!)
When I get the results of the "742" cam back, I'd like to add them to the post so all info would be on one post but don't see a way to do that now.
I didn't realize this would happen, when I first noticed the presence of the DELETE buttons; just assumed they'd work!
I've reported this to The Higher-Ups.
Meanwhile, why not simply remove the entire thread and post new photos? Or can you not do that, either?