Virtual file system

Hi, I am new here and this is my first question.

I use nextcloud at a provider in the Internet. The original of the data is of course on my HDD at home. My home is the “center” and should remain allways actual. I use the nextcloud client at home, in order to have all the data allways synced.
As far as I know will the virtual file system update files only, if you use them. Does this mean, if i create a file at any place in the browser or if I upload it at any place in the browser it will not be synced to my home, until I use it?
I`d like to have them synced anyway, no mater whether I use them or not.
Thank you, greetings from Switzerland.