Media: Add the option to attach/detach an image to a post/page

[rachelmcr]

Can we add the option to attach/detach an image to a post/page, like the feature available in the wp-admin Media Library’s list view?

Internal ref: pbArwn-Lo-p2

[stale]

This issue has been marked as stale because:

• It has been inactive for the past year.
• It isn't in a project or a milestone.
• It hasn’t been labeled [Pri] Blocker, [Pri] High, or good first issue.

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