What’s the best method to use this is sequencer when rendering a cinematic? Is there way to take the tile sets offline?
What’s the best method to use this is sequencer when rendering a cinematic?
Just make sure the level sequence is in your level (not just an asset in the content browser) and Cesium for Unreal should automatically wait for all the data for each frame to load before allowing the frame to be snapped.
Is there way to take the tile sets offline?
No, not really. You can license Cesium World Terrain and Sentinel-2 imagery from us for local use, if that helps. But if you want Bing Maps satellite imagery or Google Photorealistic 3D Tiles, it’s a violation of the terms of use of both of those to download them for offline use.
How does the tiles loading work with sequencer? I need the tiles loaded from further away so there are no pop ins?
“No” pop-ins is probably an unrealistic expectation. An LOD switch has to happen at some point if your camera is moving. Unless you’d like to try to load petabytes of data onto your GPU before you start recording? 
But they should be relatively subtle, because of the “wait for tiles to load before snapping the frame” behavior I mentioned. Reducing the Maximum Screen Space Error (say, to 8 from 16) may help if needed.
Could you explain this a bit more? There is no tutorial for making movies with the Cesium data set in Unreal. I have found that I cannot animate the dynamic pawn as a cinematic camera could be.
The DynamicPawn’s view is controlled by its ControlRotation, but not its ordinary transform. I believe this behavior is inherited from Unreal’s default Pawn, not something specific to the Cesium pawn. So I wouldn’t recommend using the DynamicPawn for video recording. As I mentioned in the other thread, you should tell us more about what problems you’re running into while using a standard camera.