I use a NAS for all my important documents and my need is to have all my important files accessibles from all my devices on the cloud.

Currently I use the sync software and I just had to make a link (mklink) of a network directory on my NAS so that all the files were in the local directory associated with sync and all the files became accessible from everywhere . If I modify a NAS file it is automatically updated in the cloud.

Otherwise it would be to have the option to add a network directory to sync via proton drive