Auto-generation of a Let's Encrypt certificate for HTTPS

I have

services:
  traefik:
    volumes:
      # Mount ACME shared json config for lets-encrypt
      - $PWD/.custom/traefik_custom/acme:/acme
certificatesResolvers:
  letsEncryptCertResolver:
    acme:
      storage: /acme.json

instead of

services:
  traefik:
    volumes:
      # Mount ACME shared json config for lets-encrypt
      - $PWD/.custom/traefik_custom/acme:/acme
certificatesResolvers:
  letsEncryptCertResolver:
    acme:
      storage: /acme/acme.json

This may be the reason why.
If so, I suggest to update the documentation to reflect what is configured by default in the template dockerfiles.

Thanks for pointing that out, indeed it should be corrected in documentation and example code.

Confirmed: this was the reason.
It works now! Thank you.