You just set up a two way sync.

One folder- a Notes folder where all your "vault"s are- on your phone. That syncs with a folder on the cloud. Then get the sync app client on your laptop/PC. Then sync a local folder from your laptop with the cloud folder.

The Obsidian for desktop app is pretty great.

The whole thing works great for me.

So it's like this-

    _______                  _________________                        ________
    |phone |---------------> |cloud           |<--------------------- |laptop|
    |notes |  (2 way sync)   |folder of       |     (2 way sync)      |notes |
    |folder|<--------------  |MEGA/DB/box/sync|---------------------> |folder|
    -------                  ------------------                       --------

This method is tried and platform agnostic. All you need is a client that is available for your platform.