Greetings.
i had put a lot of work into the '20 version...plays, playbooks,etc.
just purchased '21 and starting to dig into it, but rather hopeful if some/any of my old work can be 'ported' over to have a start from somewhere further than 'back at zero'.
Frankly taking months to see needed tweaks and implement them, if they will not work on new versions just a few months later probably would erase my desire to do that again so really hoping.