Importing a blender camera into unreal

Hello. Shot in the dark here but would be delighted if someone knew the answer. I’m trying to use my blender camera in unreal. i’ve followed youtube tutorials obvs. the crazy thing is this. A 300 frame track is cut down to 129 by blender.
[2023 02 22 23 52 31 - YouTube] (2023 02 22 23 52 31 - YouTube)
This is where I’m upto. thank you, community!
Dave