Step 1: Select "Documents" on the left side menu. 

Step 2: Decide if you want the file/folder shared with everyone or just a select few units.

OPTION 1: You can make a folder/document/file PUBLIC for all to see by clicking the box next to desired folder/document/file.  

Go over to the right side of the screen and find the heading "PUBLIC" and click the box next to it. After you click the box, there should be a green check mark. This will make the folder/document/file public for all to see at anytime.
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OPTION 2: Click the box next to the desired file or folder you would like to share with specific units. 

Next, click the share button."

Select which units you would like to share folder or document with by clicking the box next to their name. Then, click "Share."