To ease the collaborating between sender and shared users, it is possible to write comments on the shared files, even on specific time codes. By pressing the "+" icon the letter "alt+i", you can type in comments. Press the "send" bottom, and all users that have access to the link will then get an e-mail with your comments. You can then see all users commend and make a reply, even directly from the cell phones and tablets. Use the "Enter" button to create more lines and then use "Shift+Enter" to send.
Press this icon to mark in the time code.
All the same, features are of cause possible to do from insight your ioGates account under the "file info" menu.