The Nextcloud application on Windows shows the entire contents of your Nextcloud account in Windows Explorer, as if they were on your hard drive. They are indexed in search. When you access a file, it dynamically downloads that to your hard drive where it stays and is kept in sync with any changes on the server and the server is updated with any changes to the local file.
I may be pulling out the wrong term, but:
The Nextcloud application on Windows shows the entire contents of your Nextcloud account in Windows Explorer, as if they were on your hard drive. They are indexed in search. When you access a file, it dynamically downloads that to your hard drive where it stays and is kept in sync with any changes on the server and the server is updated with any changes to the local file.
Maybe on demand file sync is a better term.
Ah, like the Android app. I think the Linux Nextcloud version has an experimental option for it but I never gave it a try.
I assume the partial sync is not sufficient for your use case? I usually only sync the folders I need on that machine.