The free version of the app is limited to 1000 Shopify products in your feed
In previous versions of the Flexify app we were charging based on the number of product variants in your feed. This was very confusing & for Version 2 (SuperFeed) of Flexify we have switched to the number of products in your feed. This makes everything a lot more predictable & easier to understand.
Example:
On your shop you have two collections, Collection A has 700 products, Collection B has 1100 products. If you select collection B you will be over the limit (1000 products) on the FREE plan. You will either have to upgrade or select Collection A which is below the limit of 1000 products.