Some PDF files are empty/corrupted??

[ctobola]

When I try to upload certain PDF files, I get an error that says "Contains no data/Corrupted."

Some PDF files work, some don't. I can't seem to tell what's triggering the error. 

I've resaved, renamed, optimized and done other things to the offending PDF files... nothing seems to help. I've also tried to upload working and nonworking PDF files at the same time -- the working files upload, the others get the error message above.

Suggestions?   Thanks!  -Cloy

[Joachim Müller]

Coppermine doesn't touch PDF files at all, the only thing that could have happened is that the http upload has timed out due to the sheer file size of your PDFs and the settings on your server. As coppermine admin, you're encouraged to FTP upload and batch-add: try it and report back if this fixes the issue for you.