How can I give a maximum number of photos to my user?

Hello everyone. I can’t figure it out myself. I want to offer a scalable subscription to my users. My users are allowed to post photos of a certain event. I give each event a unique ID. For example, I can post 10 photos per event ID with a basic subscription. With an upgrade subscription, he can post 20 photos at each event. My user posts photos to that event with a form. Those photos are shown in the app with a custom list. How can I give the number of photos a max amount in that list. This may also be done when placing the photos in the form. That he can’t add any more photos to the ID event, for example, for 10 photos. How do I set that up. Thanks in advance

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