Drag it? Drag it? What “it”? From where?
(Now that I have solved my dilemma, it is very funny, I laugh as I type.)
I use an external monitor for preview.
My workflow has always been:
Linux folder -->> Playlist -->> Timeline
During the assembling of clips on the Timeline, my Preview window on the external monitor is typically covered over by my task-management program.
I had never been aware of the drag-from-Preview-window-to-Playlist operation.
So all I had was a tone and a momentary flash of something in the empty Preview window space.
(…and I had never tried out Icons mode for “Lista de reproduccion”, so I had never seen anything like what I saw on your second GIF)
It took at least ten minutes of digging until I realized what was happening. Trying to drag from the empty Preview window, trying to drag the bar under the empty preview window, puzzling out the Spanish Shotcut labels…
Thank you for you patience, @ejmillan, finally now I have it.