Boolean indicating whether or not attachment data is stored into the database. Some persistence stores,
such as the local filesystem, would want the data stored into the database to allow for hydrating the
data from the database in case it is not on the local file system. This is used when you have a cluster
of portal servers and a server may not have the content hydrated locally. Other persistence stores, such
as a network share or S3, store their data external to the portal server so there is no need to have the
file data stored into a database.
Returns:
True if the file data is stored in the database, else false.