You need to configure ‘RevisionSettings’ in Workspace-Config.xml file for the content type you want to check-in silently. ‘Workspace-Config.xml’ is located in “Server\webapps\workspace\WEB-INF\classes” folder.
For content type “Picture”, use the following RevisionSettings:
Please update the Collection, Workflow and Status as defined in your Platform Server.
Note: You need to restart your Platform Server after making these changes in Workspace-config.xml.