Share Plans within App?

I know that I can publish the touring plan and send a link to anyone. However, if everyone in my party have the LINES app, is there a way to share the touring plans within the app to them so they can follow along on their phones?

What I’m hoping for is the whole party to see the list of attractions for the day and also see them get checked off or marked DONE along the way. How can I do that?

I recall people asking about this before. The consensus was that you would have everyone sign in using the same ID, but there was some concern that multiple people accessing the same plan might cause corruption. Hopefully someone who tried it can chime in. You could also make a test plan and try it out yourself.