Hi @Mappin' Jack Flash
Thanks for the reminding!

Yes. I was following the instructions I found at https://github.com/yuuhayashi/citygml-osm/issues/94 for the imports.

But to be honest, I'm not quite sure that I know exactly the full flow beyond that instructions of doing so. Like to be approved/buy-in as a participant, etc,.

So since it's kinda my hobby and I'd like to contribute to OSM. I'm thinking it's also a chance for me to learn the formal steps to work with the community.

Please feel free to revert any improper changesets I made. I'm reading more documents you shared in the post. And please do let me know how I could do better with the OSM community. 

Thank you very much :)