appwrite/app/config/storage/outputs.php

<?php

return [
    // Accepted outputs files
    "jpg" => "image/jpeg",
    "jpeg" => "image/jpeg",
    "png" => "image/png",
    "webp" => "image/webp",
    "heic" => "image/heic",
    "avif" => "image/avif",
    "gif" => "image/gif",
];