Error, "failed to upload file, internal error..." With PDF's

Whenever I try to upload a PDF into the assets/files folder it gets to 50% then freezes.
After a pause it returns the following error in a alert box: Error, "failed to upload file, internal error..."

To get around this I have been uploading PDF’s in my FTP program, cyberduck, into the assets/files folder.

The assets/files folder has 777 permissions.

Sounds like either a file upload size limit (either in PHP or in the Apache configuration) or a timeout (again could be either PHP or Apache configuration)

Can you upload small text files or images?

yes! images are fine for me to upload. ok i just checked the file sizes and the PDFs are pretty big considering their content, the one I checked was 4mb while the images I have uploaded are like 590kb and less

Thanks sottwell i compressed the PDF and wallah! all is good! thank you so much for your help!

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