Good news, everyone!
Now you can share and pin the objects (images, gifs, videos, text&links) with one button:
To add an image, click 'Add Image' and drag-and-drop or paste object:
You can control your added image by clicking on it (resize, pin or delete):
Keep in mind that if you don't pin an object and move to the other room or leave space, it will disappear. In this case, you will get this warning:
This also works for gifs, videos, text&links.
You can prevent the participants from pinning added items in the room permissions: