A file sync app is a service or program that provides a convenient way to automatically sync your files across multiple devices. Wherever you are logged into the file sync app, the same files will be available to open, edit, copy, stream, etc., just as if you were on the device where you originally uploaded the file.
5 Best File Sync Apps | For Android & iOS
File syncing apps have many uses, and the apps discussed here work well for most needs. Dropbox, for example, stores your files online so you can access them from anywhere, while Resilio Sync skips servers altogether and syncs via a peer-to-peer connection.
Dropbox is one of the most popular cloud storage services, and for good reason. Anything you put in your Dropbox folder on your computer or with the Dropbox app is backed up online and available for download to any other device signed into the same account.
Dropbox is a file syncing utility that is easy to use because the folder where you save files on your device is replicated to all computers and mobile devices signed into your account.