Due to storage limitations, when you export screens into a project, you'll be limited on the number of screens a project can have depending on the subscription plan that the project owner has:
Free plan: 100 screens
Basic plan: 1000 screens
Advanced, Team, Organization, and Enterprise plans: Unlimited screens
☝️ If you're on one of the deprecated Starter or Growing Business plans, you can export an unlimited number of screens to your projects.
To publish more screens, you can upgrade your plan using this link: https://app.zeplin.io/profile/billing