Camera - picture notification - missing image

Hi!
I’ve been dealing with this topic for hours now, but it doesn’t work the way I would like it to.
I have the following configuration:

### CAMERA ###
...
  action:
    - service: camera.snapshot
      data:
        entity_id: camera.in_8015fhd
        filename: '/share/snapshot/snapshot.jpg'
    - delay: '00:00:02'
    - service: notify.mobile_app_phone_christoph
      data:
        message: "Bewegung Eingang erkannt!"
        data:
          image: "/share/snapshot/snapshot.jpg"

### CONFIG ###

homeassistant:
  whitelist_external_dirs:
    - '/share/snapshot/'

The picture is created during a movement and stored in the corresponding folder. I also get the title of the message, but not the associated picture.
I have read posts where “/ local /” was specified for the path, but i do not have the “www-folder”. Even after creating the folder in the “config-folder” and adjusting the path accordingly, the file could not be sent.

I would be happy about suggestions!

Thank you so much!
Christoph

You have to restart after creating the www folder.

Url for image is missing, you can test it if you see your address: https://companion.home-assistant.io/docs/notifications/notification-attachments

    action:
      - service: notify.notify_group
        data_template:
          message: bla
          data:
            attachment:
              url: "https://your_ha_address_from_outside/local/image/bla_latest.jpg"
              content-type: png
              hide-thumbnail: false

Thank you for your answer.
I have already tried this, the folder was created and Home Assistant and the host restarted, both times without success.

Oh sorry, i forgot to say, i have an Android phone. I think in this case the configuration would be okay:

automation:
  - alias: Notify Mobile app
    trigger:
      ...
    action:
      service: notify.mobile_app_<your_device_id_here>
      data:
        message: "Something happened at home!"
        data:
          image: "https://github.com/home-assistant/home-assistant-assets/blob/master/logo-round-192x192.png?raw=true"

I think it’s because i save the pictures locally in my network/on my Rasp and want to retrieve them from there and not via an extern http(s) request.