attachment_fields_to_save

apply_filters('attachment_fields_to_save') is found 3 times:

• /wp-admin/includes/ajax-actions.php line 3224

  		wp_send_json_error();
  	}
  
  	/** This filter is documented in wp-admin/includes/media.php */
  	$post = apply_filters( 'attachment_fields_to_save', $post, $attachment_data );
  
  	if ( isset( $post['errors'] ) ) {
  		$errors = $post['errors']; // @todo return me and display me!
  		unset( $post['errors'] );
  	}
  
  

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• /wp-admin/includes/media.php line 792

  			 *
  			 * @param array $post       An array of post data.
  			 * @param array $attachment An array of attachment metadata.
  			 */
  			$post = apply_filters( 'attachment_fields_to_save', $post, $attachment );
  
  			if ( isset( $attachment['image_alt'] ) ) {
  				$image_alt = wp_unslash( $attachment['image_alt'] );
  
  				if ( get_post_meta( $attachment_id, '_wp_attachment_image_alt', true ) !== $image_alt ) {
  					$image_alt = wp_strip_all_tags( $image_alt, true );
  

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• /wp-admin/includes/post.php line 435

   
  		$attachment_data = isset( $post_data['attachments'][ $post_id ] ) ? $post_data['attachments'][ $post_id ] : array();
  
  		/** This filter is documented in wp-admin/includes/media.php */
  		$translated = apply_filters( 'attachment_fields_to_save', $translated, $attachment_data );
  	}
  
  	// Convert taxonomy input to term IDs, to avoid ambiguity.
  	if ( isset( $post_data['tax_input'] ) ) {
  		foreach ( (array) $post_data['tax_input'] as $taxonomy => $terms ) {
  			$tax_object = get_taxonomy( $taxonomy );
  

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