Viewport and animation

Hi guys! I need some help! I created two level sequences in Unreal 4.27, with different, simple animations. At the beginning of both animations the objects set scales 0, so they are not visible! These animations are controlled by the blue print of two buttons, pause and play on the keyboard. The buttons work ok, the problem occurs when I want to press the play button in Unreal and in the viewport the animation is displayed in the middle of the timeline.

In conclusion, how do I make my animations appear in the viewport only when I press the button?
Can I do that?

Update on the situation! Can anyone help me !?
I noticed that if I link “Event BeginPlay” directly to “Play” in BluePrint,
the animation is displayed correctly in the simulation, but if I connect a button on the keyboard to play the animation is played from the middle! Does anyone have any idea why this is happening?
We’ve created a short video below so you can better understand what’s going on!