They cannot leave comments via the mobile app or via web view from their mobile device at this time.
You also have the option to first adjust default settings for your public share link by clicking Link Settings at the bottom of the modal. Take a deeper dive into sharing settings here.
Find out how to share a specific screen (or screens) here.
To create a URL share or public share link for your board:
Navigate to your InVision dashboard and open the board you'd like to share.
Click the Share icon at the top right of your board.
Copy the link to begin sharing with others.
To share a specific item from your board, hover over the item and click the share icon (). You can then copy the URL and share it with others. Anyone accessing that link will only be able to view that specific board item.
To share your freehand:
Sign in to your InVision account and navigate to the Projects page.
Open your freehand and, at the top right of the page, click the Share button.
Click the drop-down arrow and set the permissions to Can edit or Can view only.