I’m installing Hanwood Hybrid flooring on top of existing tiles. The house has an awkward layout with lots of diagonal corners and I’ve hit the first big challenge.

1. Do I cut the board so it fits the shape of the doorframe? And if I do, do I still leave 9.5mm expansion gap and then how do I finish it at the end?
2. Do I cut into the door frame (metal) and slide the board under?
Any tips are much appreciated!
Thanks,
Pascal