When you upload a file in Documents or Sites Explorer, its size is limited to 200MB by default.
To change this limit, edit the exo.ecms.connector.drives.uploadLimit property in the following files.
See Configuration overview for how-to.
$PLATFORM_TOMCAT_HOME/gatein/conf/exo.properties (Tomcat).
$PLATFORM_JBOSS_HOME/standalone/configuration/gatein/exo.properties (JBoss).
For example:
exo.ecms.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).