By default that selector uses only images of the album. You can enable subalbum images of that album on Option > Gallery > Gallery behaviour. But note it may cause overhead if you have lots of subalbums and lots of images. You cannot enable images from totally different albums. You would have to upload the image to that album as well.
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By default that selector uses only images of the album. You can enable subalbum images of that album on Option > Gallery > Gallery behaviour. But note it may cause overhead if you have lots of subalbums and lots of images. You cannot enable images from totally different albums. You would have to upload the image to that album as well.