there are upload limits but also upload formats. Do you have the correct upload format as well?

there is an attachment key that comes up when you try to upload....



Attachment Key
Filetype Max Filesize Max Width Max Height
bmp 19.5 KB 620 280
doc 19.5 KB - -
gif 195.3 KB 800 800
jpe 19.5 KB 620 280
jpeg 19.5 KB 620 280
jpg 97.7 KB - -
mov 17.17 MB - -
mp3 17.17 MB - -
mpeg 17.17 MB - -
mpg 17.17 MB - -
pdf 19.5 KB - -
png 19.5 KB 620 280
psd 19.5 KB - -
txt 19.5 KB - -
wav 17.17 MB - -
wmv 17.17 MB - -
zip 97.7 KB - -