media library empty for 2nd language

Hello,
I get a website with english adn french version, like : mydomain.com and fr.mydomain.com.
The option media translation is activated.

When I add an image into the media library for mydomain.com, this image isn’t displayed into the media library for fr.mydomain.com.

If I desactivate the media translation option, the media library became filled, but I can’t create traductions for new images.

So, how can I do to use the same image with different texts into both by 2 versions ?

Thanks for any help.