If its small enough you can use the uploads section, but its advised to use another service if its not terribly important. Don't want to waste the site's space. Most of us use Dropbox. A service that lets you upload files from your desktop.
https://www.getdropbox.com/referrals/NTY2NjUxNjk
Use my referral and you get an extra 250 megs storage, as do I.