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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 exo.properties file.
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).