Checking a boolean variable from one blueprint to another

I have a blueprint BP_LevelTrigger and a Blueprint Levels UI widget. In Level Trigger, when some action occurs, the Boolean variable becomes true. How can I make it so that if in Level Trigger bool = true, then in Levels Ui Play Animation occurs? Please help!

Best is to get middle man blueprint. Like player character, game mode, player hud, really anything that is easy to find, and does not make additional and unnecessary references.

For this i would vote for player character, or player controller.

Also do not use level blueprint, it sometimes makes hard to get valid references to other blueprints (because on begin play for level not everything else is yet loaded). So make custom blueprint actor that has trigger, and checks for it.

Also #2: do not set variables for this, instead use events. Declare event in middle man blueprint, and in umg widget. Then door/whatever that has trigger, calls that event in player character, then player character triggers similar event it whatever bp does animation.

i think this tut explains most of stuff you want.