Smart Synchronization is basically the default setting on our iOS app that helps prevent eating up your cellular data on your mobile device.
If you have a WiFi connection, Fieldwire will always download all project data, regardless of your Smart Sync settings. If you have no WiFi connection and are just using cellular data and have Smart Sync enabled, Fieldwire will only download low resolution plans; it will not download any prefetched files. "Prefetched" files are any photos, videos, or other files in the project, not just the files you might happen to access while using the app. These files will only be downloaded when you attempt to view them, such as photos within a task or files on the Files page.
When Smart Sync is disabled, Fieldwire will download all project data over cellular; such data includes high resolution tiles for sheets and all project photos, videos, and files.
Keeping Smart Sync enabled is helpful if your mobile device does not have an unlimited data plan and you have no access to WiFi.
Disabling Smart Sync is useful if you anticipate being offline (and thus need access to everything) or do not care about storage/downloading large amounts of data on your mobile device.
Smart Sync only works on a per-user basis, meaning what one project user selects for his/her own account will not affect the Smart Sync settings for other project users.