Slideshow, Family photos

Hello everyone,

I am looking to create a slideshow of family photos.
At this point, I managed to mount a share of a NAS file on the local media of HA
I loaded the custom:gallery-card
But I have display errors on this map while going through multimedia / myfolder I can see my images when I click on it.
I tried jpeg or png, still in error


Has anyone managed to display images with custom:gallery-card?
Or do you know another card?