Send files to social networks "Classmates" originally missing due to the danger of creating additional load on the site servers. If you need to send a message with an attachment to another user, you will have to resort to some tricks. For example, if you want to send a picture or video, just upload them in the appropriate sections of your profile, and then send another user a link to them via private messages.
Contact your friend and ask him in what way it will be easier to accept the file from you. For example, ask what his email address. Most likely, email is available to each of your contacts as its address must be specified at registration in the social network. Knowing the email address go to your mail service and send your friend a letter, attaching to it the desired file as an attachment.
Ask, if the user registered account in any online messenger like ICQ or Skype. These services allow you to share various files. This will need to send your friend a notification about adding it to the list of your contacts. To send a file, simply move it with the mouse in the box to create messages. You can also learn whether a user's registered accounts in other social networks, which provide for the possibility of exchange of files, and then perform the transfer with them.
Upload your file to one of the special Internet services, such as Depositfiles, Zippyshare, etc. after the download has completed you will be given a link to download a file that you can send to your friend in a normal message on a social network "Schoolmates".