Ok so we either need:

A. Auto sort - that will sort all items in some kind of order and possibly also combine stacks of the same items, so if you have a few Item A in slot 1 and a few more Item A in slot 2, it will combine them all into Slot 1.

I can add auto sorting to the inventory system but it's difficult to know exactly how items should be sorted. It could just be sort all Armor by type first, then all weapons, then all consumables etc. etc. etc. but I just know if I add something like that everyone is going to start asking for more options to it, to ignore this, or ignore that or sort it differently and it will end up really complicated and messy. If I add such a thing it will be a simple one click sort by item type then item name.

or B. The name of the item you are currently dragging to display above the icon as you are dragging it and the name of the item you are currently hovering over to also display it's name so you can see which item it is you are dragging onto.

or the most simple and probably most effective, C. Different icons for each card - something like we have for Accessory enhancements where it has the first few letters of the type of stat it gives or something similar.

I think B will be fine, or maybe D. i click on item in invo and same type will like shine or something.. for example 3 cards in diff slots will be colored red..

I agree with the above. Need auto sort.