Yeah, you’re allowed to use whatever makes your team comfortable. As long as you don’t use AI features that Flip book may have (I never heard of it so I don’t know if there’s any) or plagarize, etc, etc, follow the normal rules and all- You should be fine.
Check out the https://www.vexforum.com/t/are-you-allowed-to-make-your-own-vex-engineering-notebook-on-canva/ post on the forum if I didn’t make sense.
Have a good one 
