What kind of files?
The file needs to match the accepted extension types and dimensions.
bmp 512.0 KB 2400 1200
doc 512.0 KB - -
gif 512.0 KB 2400 1200
jpeg 1.14 MB 2400 1200
jpg 1.14 MB - -
pdf 512.0 KB - -
png 512.0 KB 620 280
psd 512.0 KB - -
txt 512.0 KB - -
zip 512.0 KB - -
If it is something other than one of these files, or larger than the limits above, it will not attach.