bp_document_activity_update_document_privacy( $activity )

function bp_document_activity_update_document_privacy( $activity ) {
	$document_ids = bp_activity_get_meta( $activity->id, 'bp_document_ids', true );

	if ( ! empty( $document_ids ) ) {
		$document_ids = explode( ',', $document_ids );

		foreach ( $document_ids as $document_id ) {
			$document = new BP_Document( $document_id );
			// Do not update the privacy if the document is added to forum.
			if ( ! in_array( $document->privacy, array( 'forums', 'message', 'media', 'document', 'grouponly') ) ) {
				$document->privacy = $activity->privacy;
				$document->save();
			}
		}
	}
}