Allowed attachment type and size

[Haiyang Ai]

These are the valid file extension for attachment uploading to Corpus4u Community:
doc gif jpeg jpg pdf png ppt ps rar rtf txt xls zip

doc: 1M
gif: 200K
jpeg: 400K
jpg: 400K
pdf: 3M
png: 400K
ppt: 500K
ps: 3M
rar: 4M
rtf: 1M
txt: 500K
xls: 500K
zip: 4M

We may modify the sizes according to our web server space usage in the future.