Anyone tried the Scene_Strip_Tools?

Amazing addon from tin2tin, Huge thanks to him and all his tools *chef kiss

BUT I can a hard time to make it work: after I clicked Link sequencer to 3Dviewport where there were 2 camera in the scene (didn’t blind it to the marker as i saw in the video tutorial) , added both of them as scene strip, as I scrolled through the sequencer timeline, the 3D viewport just sticked with the active camera instead of switching between camera?

And with this tool are we not supposed to edit the camera directly with the strip in sequencer (I took it as premiere where you cut the strip shorter and the animated camera would just stay where you cut) ? e.g. I have both camera animated from f1-f10, we can’t move the second camera strip to f20 to f30 and keep the animation? (the animation stay f1- f10)

blender beginner here, probably some fundamental stuff I got mixed up. If anyone has experienced with this addon or this workflow, some enlightenment would be appreciated!
(Sorry not enough level to post my screenshot for it :/)