The POST methods are used to manually force the synchronization to the destinations.
There are two endpoints that allow you either to synchronize all the files which require that or to synchronize just one specified file.
Synchronization of all destinations
Determines whether finished synchronization should schedule a next pending one (there can be only a limited number of concurrent synchronizations to a destination file system). The reports of such synchronizations will not be included in the returned DestinationSyncResult object.
The result is an array of DestinationSyncResult objects that contains reports about performed operations.