To upload files and documents on a group-level, go to your group, and click on “Public Docs”
Click “Upload Files” and upload your documents. Note that files and documents uploaded here are viewable to EVERY member of the group. You do not have the option to customize privacy settings here.
You also have the option to create a folder. Again, this folder and the documents it contains will be viewable to all group members.
Fill in folder details. Click “Create new folder” when done.
Once done, the folder you created can now be viewed by group members
Inside your folder, you can upload different files if you wish. The process for uploading files inside a folder will be similar to uploading files in Public Docs