Groups.io provides a Files feature that members can use to upload and view files on a group’s website. Files can be organized in folders. 

A group’s Files section can also contain links to files that are stored in external locations such as Dropbox and Google Drive as well as links to other websites.

Note:

• Group owners determine whether the Files feature is available in their groups and, if it is, who can view and upload files: all members or only owners and moderators.
• The size limit for an uploaded file is 2GB.