apply_filters( 'image_sideload_extensions', string[] $allowed_extensions, string $file )

1050		 * @since 5.6.01051		 * @since 5.8.0 Added 'webp' to the default list of allowed file extensions.1052		 *1053		 * @param string[] $allowed_extensions Array of allowed file extensions.1054		 * @param string   $file               The URL of the image to download.1055		 */1056		$allowed_extensions = apply_filters( 'image_sideload_extensions', $allowed_extensions, $file );1057		$allowed_extensions = array_map( 'preg_quote', $allowed_extensions );1058 1059		// Set variables for storage, fix file filename for query strings.1060		preg_match( '/[^\?]+\.(' . implode( '|', $allowed_extensions ) . ')\b/i', $file, $matches );1061 1062		if ( ! $matches ) {