How do I change a photo or quantity limit on individual items that I added from the catalog?
After you add an item to your collection you can change an item image, price, description and quantity available by clicking on the blue drop-down arrow on the right side of the item box. This will open up that individual item and allow you to make changes.
On the app, simply tap the item on your items view:
On the web, click the dropdown arrow to see edit feature. You can also simply click the name of the item to open your item details: