Step 1:  Click on 'Viewers' for the desired file. 


Step 2:  Click the three dot 'More' menu next to the desired viewer. From the dropdown, select 'Resend Email.'


Note:  You can Adjust Security Permissions from this dropdown before you select 'Resend Email.'


Step 3:  The 'Share' panel pops up with the recipient(s) name and previously selected Security Permissions already entered. Make adjustments, enter an email message if you choose, and press 'Send.'



Note: You can select multiple recipients in the Viewer List and resend email to all at once.