function move_attachment_to_protected_dir( $attachment_id ) {
		// Get attachment metadata.
		$metadata = wp_get_attachment_metadata( $attachment_id );
		$file     = get_attached_file( $attachment_id );

		// Get the protected upload directory.
		$protector = new LLMS_Media_Protector();

		// We could check that the file is in the protected folder, but currently there's no "unprotect" method.
		if ( $protector->is_media_protected( $attachment_id ) ) {
			return false;
		}

		$protected_dir = $protector->get_upload_basedir();

		global $wp_filesystem;
		if ( empty( $wp_filesystem ) ) {
			require_once ABSPATH . '/wp-admin/includes/file.php';
			WP_Filesystem();
		}

		$new_file = str_replace( wp_upload_dir()['basedir'], wp_upload_dir()['basedir'] . untrailingslashit( $protected_dir ), $file );
		if ( ! $wp_filesystem->is_dir( dirname( $new_file ) ) ) {
			wp_mkdir_p( dirname( $new_file ) );
		}
		if ( $wp_filesystem->move( $file, $new_file ) ) {
			// Move thumbnails if they exist.
			if ( ! empty( $metadata['sizes'] ) ) {
				$base_dir     = dirname( $file );
				$new_base_dir = dirname( $new_file );

				// Multiple registered sizes can share the same physical file.
				$moved_files = array();

				foreach ( $metadata['sizes'] as $size => $size_info ) {
					if ( in_array( $size_info['file'], $moved_files, true ) ) {
						continue;
					}

					$old_thumb = $base_dir . '/' . $size_info['file'];
					$new_thumb = $new_base_dir . '/' . $size_info['file'];
					if ( ! $wp_filesystem->exists( $old_thumb ) ) {
						error_log( 'Registered metadata thumbnail file does not exist. Skipping. ' . $old_thumb );
						continue;
					}
					if ( ! $wp_filesystem->move( $old_thumb, $new_thumb ) ) {
						error_log( 'Unable to move protected file. Thumbnail moving failed: ' . $old_thumb . ' to ' . $new_thumb );

						// Move the file back along with any thumbnails we already moved.
						$wp_filesystem->move( $new_file, $file );
						foreach ( $moved_files as $moved_file ) {
							$old_thumb = $base_dir . '/' . $moved_file;
							$new_thumb = $new_base_dir . '/' . $moved_file;
							if ( $wp_filesystem->exists( $new_thumb ) ) {
								$wp_filesystem->move( $new_thumb, $old_thumb );
							}
						}

						return false;
					}

					$moved_files[] = $size_info['file'];
				}
			}

			// Update attachment location in database.
			update_attached_file( $attachment_id, $new_file );

			// This only exists with images it seems.
			if ( array_key_exists( 'file', $metadata ) ) {
				$metadata['file'] = ltrim( $protected_dir, '/' ) . $metadata['file'];
				wp_update_attachment_metadata( $attachment_id, $metadata );
			}

			$protector->add_authorization_meta_to_media_post( $attachment_id );

			return true;
		}

		error_log( 'Unable to move protected file, check permissions on the protected directory or existing file with the same name: ' . $file );
		return false;
	}