I'm looking for other Synology Drive on Windows users' input on this matter. I currently have Synology Drive sync tasks for my window pc desktop, documents, photo, video, music, download folders. Syncing has been working fine and usually on some of the bigger sized folders (photos & music) I would have right clicked on those folders and chose an option call "Free up local space." This works well because then the data exists on the nas but can be viewed on the computer. When you view an item on the computer it will download and then you can view.
With a recent Synology Drive update things have been reeking havoc. I use iTunes desktop app and I plug in my phone to the computer just to make a iTunes backup of the phone. I have noticed that when I do this it triggers a full sync on the photo & music folder.
Can anyone else who has Synology Drive for Windows and uses iTunes for desktop, and has a sync folder where they had chose the option to "free local space" confirm if they see the same behavior? Eventually I think I will have to get in contact with Synology Support, but just need to rule out that this would happen for all instances and not just my setup.