How do I know if a Page is already added to the Active Stack?
The Add to Stack icon is modify when you are viewing a Product Card or a Page if there is at least one item added to the Active Stack. If you are adding Pages to a Stack from the plus symbol on a Stack if there is at least one item on the Page has been added than a check mark will be located in the right corner of the Product Card. If there is more than one item available on the Page, than you have to tap the Add to Stack icon to determine which item(s) are already added to the Page.
1. Product Card or Product Page
1.1. If you are viewing a Product Card, the Add to Stack icon is blue
1.2. If viewing a Page, the Add to Stack icon is solid white
1.3. If more than one item is available to be added to the Stack - tap on the Add to Stack icon to view which items have been previously added
1.4. Only the items with a blue check mark have been added to the Stack
2. Viewing items from the Add to Stack icon (plus symbol) on the Stack
2.1. The Page will have a green indicator in the upper right corner and the card is highlighted gray
If there is more than one item already on the Stack within that Page, a number appears in the green circle indicating how many items from that Page are on the Stack.