SOLVED (Workaround) : NFS - manual mount of NFS folder failed

Thanks @m0wlhed for the proposal.

I do not feel for the moment to have the knowledge actually to setup this configuration , so I will use the method i have seen in the forum :

=> nfs-common has been installed in the Debian OS for the connection issue = OK

1) manual mount command from the homeassistant container in the Portainer console

mount -t nfs 192.168.1.xx:/volum1/homes/xxxxx/ /config/media/xxxx/

2) test with “developper Tools/Service”

service : camera.screenshot
entity : Test camera

service data :

entity_id: camera.xxxx_ovprofile00
filename: /config/media/camera/test.jpg

=> The test.jpg camera screenshot is sent to the proper NAS folder (volume1/homes/xxxx) = OK

3) Test with an automation ( camera screeshot sent to NAS when motion detected)

Automation code

- id: '1599228545663'
  alias: Motion  FGMS-01
  description: Actions suite motion Fibaro FGMS-01
  trigger:
  - device_id: c52b50d6959a439a8ce79b8cae0db055
    domain: binary_sensor
    entity_id: binary_sensor.fgms001_zw5_motion_sensor_home_security_motion_detected
    platform: device
    type: motion
  condition:
  - condition: or
    conditions:
    - condition: state
      entity_id: alarm_control_panel.home_alarm
      state: armed_away
    - condition: state
      entity_id: alarm_control_panel.home_alarm
      state: armed_night
  action:
  - data:
      message: AUTOMATION! Motion sensor FGMS-01 triggered in Away / Night mode
    service: notify.pushbullet
  - data:
      entity_id: camera.dcs_942l_ovprofile00
      filename: /config/media/camera/D942L_{{ now().strftime("%Y%m%d-%H%M%S") }}.jpg
    entity_id: camera.dcs_942l_ovprofile00
    service: camera.snapshot
  mode: single

=> There is a camera screenshot ( jpg file ) in the NAS shared folder = OK but not in the HA local folder (NOK)

4) Automatic mapping of the NFS folder mount

To create an automation each time you reboot the docker or the HA , so the mapping will be restored

# Custom Shell
shell_command:
  map_nas_camera_folder: mount -t nfs 192.168.1.xxx:/volume1/homes/xxxxx/ /config/media/xxxxx

- id: '1611660762952'
  alias: NAS folder mounting
  description: ''
  trigger:
  - platform: homeassistant
    event: start
  condition: []
  action:
  - service: shell_command.map_nas_camera_folder
    data: {}
  mode: single

4) Remaining issue

a) I can view the camera screenshot in the NAS web browser in the remote NAS share folder ( volume1/homes/xxxx) but not in HA local folder /config/media/xxxx as I expect .

Is it a normal behavior ?

I noticed that accessing the local folder using SSH is OK ( jpg files are there) but not from the Web Browser ( folder empty)

b) I agree that this NFS setup is a workaround solution