kamal volume in rails app shared on host (files update both sides)

[prodigerati]

I would like to setup a hotfolder inside of my rails app public directory then on the docker host share the volume with smb on my local network.

sample docker file path /rails/public/hotfolder

I have this line in my deploy.yml file

volumes:
  - "app_hotfolder:/rails/public/HOTFOLDER"

when I kamal deploy the volume is created correctly on the host and inside the rails app docker container. However when I save new folders and files to the host volume path /var/lib/docker/volumes/app_hotfolder/ they do not show up in the rails app docker container.

How can I configure the volume: to show changes on the host and inside the app docker container and vise versa?