I usually use this for work but I think it can benefit everyone here that struggles to get all the connections lined up. Mindmaps can be uploaded to their website and accessed AND downloaded by everyone. Example: https://www.xmind.net/m/nU5G WHen downloaded, it can be imported to your desktop version and you can continue working on someone elses mindmap.

https://www.xmind.net/

It's very good in the free version already, the paid version is $15 only in case you want to support them. I'm not affiliated with them in any way.