Hi,
Seems you’ve misunderstood how to construct a portfolio correctly. First if all you should create a portfolio which can has multiple project items. Each project item can has 1 cover picture + unlimited other pictures (note: All the other pics related to the project will be shown as a detailed information inside the full screen viewer or popup when user clicks on the project’s cover from the layout). Seems you’ve created a portfolio with a single project which has cover pic + multiple other pics. You have only one project inside your portfolio that’s why you see only one tile on the layout. If the pictures which were assigned to the project as a other pics are different items, then create a project for each one. So you will see them inside the layout.
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Best Regards,
Support Team