After create media player, material and its instance, and place on the plane surface in the scene
Open Level blueprint:
Add Variable, bname as Mediaplayer;
Variable Type: Media Player → Object Reference
Complie → (a Default value will pomp up) Then select Mediaplayer → Save
Grab the Mediaplayer (the case here named Mediaplayer Frame) in Event Graph, create Open Source node and Event Begin play node, connext as follow:
Add the Media Track in the Sequencer →
R click on the clip on timeline → Properities → choose the media texture
Now can select the range of the clip of particular wanted frames area