Drag and drop based on the stream

I’ve been watching the stream to get a drag and drop inventory system working but I’ve come across a issue that I only seem to be having from what I’ve searched.

My issue is when I drag and drop a item onto my action bar it drops it completely instead. If I take the functionality away of dropping an item it works fine.

Here’s the blueprint for mine

Here’s the timecode for the stream

Is someone about that’s done this tutorial and could lend a hand?