I hear you.
I struggled with this last night, found a bunch of partial answers and finally caught a break in a random youtube video. I’m pretty new to all this but it seems you can’t drag/reference a sequence directly in a Blueprint.
What the guy in the video suggested was to select the sequence in the World Outliner or the sequencer icon in the editor window, click over to your blueprint window, right click and at the top of the stack it should ask you if you want to create a reference to the selected items. When you drag off the newly created sequence node, you now have have access to the “Play (SequencePlayer)” node, which will also add the “target > sequence player” node. And that should be it.
In my case I wanted to just bind my animation to a key press so I added a “C” key press as the Exec Input.
Hope that helps.