Diego,
The way you access a file changes when you move to node JS.
Node JS as a server allows you to open a tiddlywiki at an IP address on your local network if the "0.0.0.0" parameter if used starting nodeJS server, this is how I can go from my Android table to my desktop tiddlywikis. you can then access the wiki at its IP address and Port.
With my android devices I also rung termux and node JS on my devices and can use my desktop to look at my device based wikis.
I am not using the dropbox method at present so I cant map its use to nodeJS in my mind.
I hope that sheds a little light.
Tony