Okay so it seems like you’re destroying the item as a whole once the obtaining event is triggered, and you fix it’s static mesh to the player’s mesh to have the illusion of it being picked up, just like in the tutorial you’ve sent! Now, your initial problem was how to place it back, right? I’ve explained how in my first post, and then explained how you can remove that static mesh after your follow up question. Moving on with your current problem, all those are working and you can place that item back on the ground, but you can’t pick it up again, is that right? If so, it might be because of the lack of the collision sphere for your newly spawned actor.
If your issue doesn’t get resolved with this, or my assumption is wrong, please follow up by sharing these:
- If you’re now able to remove the item that is attached to the player’s mesh after you’ve picked it up or not
- If you’ve set the things I’ve suggested about the placement mechanic correctly or not
- A screen recording of the game as you reproduce the issue you’re having
(I watched the video you’ve sent again, I see it’s just dependent on overlapping so what you’ve sent earlier was indeed all the parts related to picking up 
)