Companion app doesn't show picture entity

Tags: #<Tag:0x00007fc3ea5e4fd8>

I have this card:

          - type: grid
            columns: 1
            square: false
              - type: entity
                entity: binary_sensor.meteoalarmeu
                attribute: alerts
                unit: alerts
                  type: picture
                  image: ''

The picture is regularly shown in my browser just after the entity card, but if i go to the home assistant app on my android smartphone the picture is not shown, showing only a blank square…
This happens also after various clearing caches… and also if i use a picture card in place of the footer
Any hints?

Are you running DuckDNS and access HA only through https? If so, try if it works with a picture of from a https site.

Yes thanks… solved !