unable to attach file

hey,
i"m trying to upload a zine in PDF format, but am unable to upload the file. i click on the "attach" button, and it claims to be uploading for about 45 seconds, and then nothing. file attachments goes back to being blank.
anyone have any ideas?

figured it out

what i needed to do was make the files smaller.
i guess when i scanned the zine the image files were pretty huge.