Allow WebP and AVIF Image Uploads

<?php
if ( ! function_exists( 'scseed_allow_modern_image_types' ) ) {
    function scseed_allow_modern_image_types( $mimes ) {
        $mimes['webp'] = 'image/webp';
        $mimes['avif'] = 'image/avif';
        return $mimes;
    }
    add_filter( 'upload_mimes', 'scseed_allow_modern_image_types' );
}

if ( ! function_exists( 'scseed_fix_modern_image_mime_check' ) ) {
    function scseed_fix_modern_image_mime_check( $data, $file, $filename, $mimes ) {
        if ( ! empty( $data['ext'] ) && ! empty( $data['type'] ) ) {
            return $data;
        }
        $ext     = strtolower( pathinfo( $filename, PATHINFO_EXTENSION ) );
        $allowed = array(
            'webp' => 'image/webp',
            'avif' => 'image/avif',
        );
        if ( isset( $allowed[ $ext ] ) ) {
            $data['ext']  = $ext;
            $data['type'] = $allowed[ $ext ];
        }
        return $data;
    }
    add_filter( 'wp_check_filetype_and_ext', 'scseed_fix_modern_image_mime_check', 10, 4 );
}