Help with animated alpha

Hello, i created a small mp4 animation that consists of a black and white loop. I’m using this as a media player texture, and imputing it into the masking of a material, so far so good.
The problem is that i have to be in PIB mode in order to play, since the thread i read told me how to make a level blueprint that starts the loop when playing the ‘‘game’’, well, this is a motion graphic and i need to render it with sequencer.
The blueprint is a simple conection from the event begin play, to an open source node that has the media player connected.

How can i make this media play at all times?