Lots of teachers across our district are using Jamboard as a great way to engage students with content during our remote and face-to-face instruction. The biggest complaint that I have heard about Jamboard is that you can't tell who did what to the Jamboard and students can actually change things in the Jam (either accidentally or on purpose) which messes up the lesson layout.  Google has heard our complaints and has finally put the same "version history" feature on Jamboards as the other Google products like Docs and Slides.  You can see who made changes to the Jam, when the changes were made, and you can restore the Jam to earlier versions to get rid of those changes.  Check it out!