Why can't i move my pivot point nor am i able to edit my strokes in grease pencil

I have many problems with my blender file. I am trying to do a 2d grease pencil animation. Ever since I used relations on my object (i don’t really know if this has anything to do with my issue)I can not weight paint my stocks individually. In edit mode, it won’t let me use the selected tool to activate specific parts to edit, and I am not able to move the pivot point of the drawn object(they have been drawn in different layers). I am stuck.i really could use some advice
Also if you could tell me how to upload a video to show you the problem better or show me a forum where this could be possible.