Hello everybody. I'm working on a project.Here is the principle of what I want to create. I have a collection of activities and a collection of users. A user can like an activity that he can spot thanks to a feed and a backend querry and I want to add a button that have an action. The action needs to result in addind the reference of the activity to a subcollection which is unic for each users and that I will display on an other page ( it's as the content that you can save on instagram and see it later on an other page). I have already created the subcollection and when I try to create the action, I have an issue ( Document ID in red ). thanks for your time.
