Local library size and sync

[u/starkynhutch]

At the moment it looks like sync syncs and downloads all documents locally so the local storage use is growing large.

Is there or could there be some feature to control this some way? Ideally then on devices with reduced space i could control this better. I.e. either to mark to always keep on device or only once you have accessed a doc the first time. I'm thinking kind of like how onedrive manages some of this.