Maybe I’m wrong, but for me, the + button above the timeline puts the clip witch is in the player, not the one in the playlist.
In 5 when you have selected the clip 2 and pressed the + button, if it was the clip 1 that was present in the player, it’s clip 1 witch is added to the timeline, not clip 2
You first have to double click on the clip of the playlist, it goes into the player and then click on the + button to add it to the timeline
@Namna is correct. To put the clip in the timeline it needs to be open in the viewer first. Either double click or select and press enter, then press + or A to append.
To put all the clips in the playlist in the timeline use the add all to timeline function.