Hello I watched two differents videos about inventories, I made the one in the 1st video. This are the videos.
Dynamic Inventory Setup - Construct 3
mediafire.com/file/tfo2djtimfda8bq/Inventory_Setup_POTIONS.c3p/file
The other one is difficult for me. (I am a completely amateur by the way)
Dynamic Inventory Setup 2 - Stacking Items - Construct 3
mediafire.com/file/yzrjos3yznnl6bq/Inventory_Setup_POTIONS_Stacking.c3p/file
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The stacking one contains logic that I'm not sure about and then to compare against yours I mean who has the time. I would set up my own inventory with an array, check out the tutorials on Construct site.