Users can comment on a Drive file provided it is shared with them. Follow the steps given below to comment on a Drive file.

1. Go to drive.google.com and sign into your Beloit account.
2. Locate the file you want to comment on.
3. Highlight the text you want to comment on.
4. Click on the Add comment ( + )  icon on the toolbar. 
5. Insert your comment on the pop-up comment box.
6. Click on Comment to post.

Now everyone who has access to the file will be able to see your comment assigned to the highlighted text. 

Note: After the comment has been addressed click on Resolve to dismiss the message. 

Users can mention someone in a particular section of a Drive file to catch their attention. Assuming the file is shared, follow the steps given below to mention someone. 

1. Go to drive.google.com and sign into your Beloit account.
2. Locate the file you would like to take this action on.
3. Highlight the text where you want to mention someone.
4. Click on the Add comment ( +) icon on the toolbar. 
5. Press "+" and enter the email address of the person you would like to mention.
6. Click on Comment.   

This will send out an email to the mentioned contact adding them to the discussion.  

Note: After the issue or comment has been addressed click on Resolve to dismiss the message. 

With the help of the assigning feature users can assign tasks to members who have access to the Drive file. Assuming the file is shared, follow the steps given below to assign a contact. 

1. Go to drive.google.com and sign into your Beloit account.
2. Locate the file you want to comment on.
3. Highlight the text you want to comment on.
4. Click on the Add comment ( +) icon on the toolbar. 
5. Press "+" and enter the email address of the person you would like to assign
6. Check the box beside, Assign to (contact).
7. Click Assign.

Now the assigned person will be notified and responsible for marking the assignment as done.