Hello,
I'm new to Powerapps and try to do something that is pretty complicated for me. Maybe someone can help me out.
So i created a catalog of different items like an online shop. I can collect an Item to the shopping cart without a problem. I also have an shopping cart overview with all my selected items, prices, quantity etc. (see screenshot)

What i am trying to do now is updating the selected quantity of a product. For example: I dont want to have 1 of product 210100 but 3. I implemented a dropdown menu to select the amount.
I tried this Code:
OnChange:
UpdateIf(Collection1; Number = ThisItem.Number; {Amount:DropDownAmount.Selected.Value})
The problem is, if i select a different value it changes all values in my gallery. But im trying to change only the value of one item in the collection.
I hope this is clear enough and someone will be able to help me with this.
Thanks a lot !