Task: I want to share the YMCA Org..pdf file to janedbwpersonatest@gmail.com via the messaging app so that, if it works for her, she may also volunteer. 
Steps:
Click on the Three dots icon of the YMCA Org..pdf file
Click on the share option
Enter the ID janedbwpersonatest@gmail.com
Click on the suggested email id 
Click on the check icon of the Notify people option
Click on the send icon at the top right corner of the screen
Click on the send icon at the top right corner of the screen