How to sync
Syncing occurs according to the schedule you have defined for each folderpair. If a schedule is not defined the folderpair will only be synced if you manually initiate it or if initiated by apps like Tasker. If no network connection is set to be allowed for a folderpair it will never sync, not even if you manually initiate it. This is to ensure you are not accidentally charged for expensive network traffic.
If files are new to FolderSync or has changeds since last sync, they are compared using their last modification date and optionally using MD5 hashes (for local files and remote providers that offers this information).
You can view sync progress on the dashboard. If clicking the sync progress card a full-screen sync progress screen will be shown.