Not possible to use docker volumes in oracle functions?

Summary

Error invoking function. status: 400 message: image has Volume definition

Content

I have a function who's image has a Dockerfile which defines a volume. When I invoke it I get the following:

{"code":"InvalidParameter","message":"image has Volume definition"}
Error invoking function. status: 400 message: image has Volume definition

 

I can't find any documentation stating that it is not possible to use volumes in a function.