When you upload a file in Documents or Sites Explorer, its size is limited to 200MB by default.
To change this limit, add the wcm.connector.drives.uploadLimit property to:
$PLATFORM_TOMCAT_HOME/gatein/conf/configuration.properties, or
$PLATFORM_JBOSS_HOME/standalone/conf/gatein/configuration.properties
For example:
wcm.connector.drives.uploadLimit=300
The size unit is MB.
As of 4.1, this configuration also takes effect on files uploaded from Activity Stream (using the Share function).