Hi—I’m new to Airtable, and have a free account for now. I’m working with a cowriter on a detailed outline for a musical. My cowriter has a Pro Plan. If I also get a Pro Plan, can we collaborate on the same base without either of us being charged a collaboration fee beyond the $20/month standard fee? If not, is there any plan that would allow us to both make changes to the same base without being charged a base-specific collaboration fee? Thanks—Peter