If you can’t download the file when needed, you won’t be able to view or work on it.

The problem, of course, is that you need to be connected to the internet if a file needs to be downloaded. There’s no need to have the data for files you never use taking space in OneDrive on your PC. A file’s data is downloaded only when you first use it - perhaps by opening it in some program.This means the files show on your machine, but they take up almost no space, regardless of how big they are. The data for those files is not downloaded.Your files appear in the OneDrive folder on your PC.You connect your PC to OneDrive by running the OneDrive app and signing in.You have files in OneDrive online, all stored on the OneDrive servers.“Always keep on this device” is a part of the OneDrive Files On-Demand feature, which is enabled by default in OneDrive settings. Files deleted from within your OneDrive folder anywhere will still be deleted from all machines synchronized with that OneDrive account, regardless of this setting. This feature applies only to files within OneDrive, and only turns off the Files On-Demand feature for individual files and folders.

Onedrive turn off