Configuring New MIME Types
If new MIME types need to be supported, update the \config\System\Config\PacketMappingMimeTypeStorage.xml file.
Only images and media whose extension is present in PacketMappingMimeTypeStorage.xml can be loaded. If the extensions are not in PacketMappingMimeTypeStorage.xml file, the transform, automate, and load process will fail in the Publish to Sites step.