Create inventory

Somewhat familiar with several game engines, and in all, creating an inventory is quite a challenge, especially for beginners. GDevelop is no exception - I found only a few examples, the best of them is the Inventoralia, but it is also an example, not a working inventory. In addition, in my opinion, it has a lot of unnecessary embellishments. Now I’m trying to convert it into a working version. The inventory uses the basic version of the inventory and the add of items occurs by 1. I use the Extrainventory extension through the slider. It works correctly with the text version of the inventory, but when buying from the shop, only 1 item is added to the inventory. How to fix it? And yet - how to set the maximum slot size and the inventory is full?

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