Re: Attachment Mod 2.0.1 by Frank H
sounds like your serverapplication denies too large files
in chapter 1.6 you can see what variables that affect this, and how they relate to each others. And then use the php info page to see what they are, afterwards jump to "Alter settings" in the Attachment mod plugin interface and set the "Max filesize" according to the documentation.
I wrote something about it in my installation guide, see the "Setup the mod" part.
(in the next version I migth use the tags for overriding stuff, but I'm not sure it will work on all servers, I need to look into that )