Add existing images from Media Library in to custom gallery

I have inside the post, and I’m interested in a way to add already existing images from media library in to this gallery? once I trying add any image I have only one option – insert into post.

Thanks in advance, Dmitry

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  1. By default, you can’t. Galleries are tied to posts, and only to posts.

    Options:

    1. Insert the gallery from any arbitrary post, via [gallery id="123"] where 123 is the ID of the post.
    2. Create a custom filter for the gallery filter hook, whereby you query/include the images that you want, perhaps by some post custom metadata (that you would also have to create)
    3. Insert images individually, rather than as a gallery
    4. Duplicate the images by uploading/attaching them also to the new post, so that they can be output via [gallery]