1. Share the file from one of these locations:On the detail page of the file you want to share—Click File Sharing Settings | With group. Or click Show All on the Shared With list then click Groups on the Sharing Settings dialog box.Next to the file in a feed—Click More Actions | File Sharing Settings then click Groups on the Sharing Settings dialog box.Next to the file on the Files page, the Files Owned by list, or the Group Files list—Click Share with groups.On a file hover—Click Share File then click Groups on the Sharing Settings dialog box.
2. On the detail page of the file you want to share—Click File Sharing Settings | With group. Or click Show All on the Shared With list then click Groups on the Sharing Settings dialog box.
3. Next to the file in a feed—Click More Actions | File Sharing Settings then click Groups on the Sharing Settings dialog box.
4. Next to the file on the Files page, the Files Owned by list, or the Group Files list—Click Share with groups.
5. On a file hover—Click Share File then click Groups on the Sharing Settings dialog box.
6. Type the name of the group you want to share the file with and click the name to select it. Repeat this step to share with more groups.
7. Select access levels for each group. By default, private group access is set toCollaborator, while public group access is set to Viewer.
8. Optionally, add a message to your post. You can @mention people and groups in your message to notify them and post the file in their feed.
9. Click Share and Close. The file is posted to each group you shared it with and @mentioned.