Playing Long Cinematics on gameplay

We’re developing a videogame with UE4, but we found a trouble adding cutscenes, we have our first two minutes of cutscene and then comes the problems.

The first problem is that .fbx files with two minutes animations is obviously too heavy, so we decide to cut it in 4 different files, then in an AnimBlueprint we create a state machine putting all together. How we must export/import our animation for this purpose?

Next problem, once we’ve done the previous thing, we create a matinee with camera groups, animate those things,but, once we decide play there are little bouncing in animations, these bouncing occur between transitions from one partition to other.

The last problem is the audio, we made animation synchronized with a dialog, but when play the scene, animation and sound are not synchronized.

I hope someone can help us.