Retrieves HTML for the image alignment radio buttons with the specified one checked.

Retrieves the image attachment fields to edit form fields.

Retrieves HTML for the Link URL buttons with the default link type as specified.

Retrieves the media element HTML to send to the editor.

Retrieves HTML for the size radio buttons with the specified one checked.

Adds the media button to the editor.

Handles a side-loaded file in the same way as an uploaded file is handled by media_handle_upload().

Saves a file submitted from a POST request and create an attachment post for it.

Retrieves the post non-image attachment fields to edit form fields.

Adds image HTML to editor.