MQTT Sparkplug decoder/encoder

I have installed the palette node-red-contrib-protobuf in Node Red. I placed the sparkpug_b.proto in a directory and used that directory path and file name. After deploying the flow, I get the following error: "No .proto types loaded! Check that the file exists and that node-red has permission to access it.". I stored the file under public documents thinking that would get by the security concerns but, apparently that is not the issue. How do I get around the security issue which is what I think is the issue unless the file "sparkplub_b.proto" is not the file.