Padlet's Canvas feature can allow you to have students post text, images, illustrations, or videos to a bulletin board and you can make sure you know who contributes what.
First, select the Canvas option when creating a Padlet.
Next, set the sharing settings to "Organization wide." This means that students will have to log in. It also means that staff and students can see your Padlet in their Shared section of their dashboard.
Next, make sure that Attribution is on in the "Modify" menu (the gear icon).
From here, students can write anywhere on the Padlet. They can also connect their posts to other posts using the vertical three-dot menu at the top of their post.
Students can use pen input if they select the "Draw" option in the horizontal three-dot menu at the bottom of their new post.