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I am using PHP with Guzzle to send a document via Telegram Bot API using sendDocument.
The file is hosted on Amazon S3 with a URL like:

https://telegramfile.xxx.amazonaws.com/file/preview/chat/02AAE430F214770D1534C6364813C1FC.txt

I try to send it like this:

$response = $client->post(
    "https://api.telegram.org/bot$botToken/sendDocument",
    [
        'json' => [
            'chat_id' => $chatId,
            'document' => $fileUrl
        ]
    ]
);

The request returns:

{
    "ok": false,
    "error_code": 400,
    "description": "Bad Request: wrong type of the web page content"
}

Things I have checked:

  • The S3 URL is public and accessible (tested with curl).
  • Content-Type is application/octet-stream.
  • The file is less than 50 MB.

Other URLs (like public GitHub raw files) work fine with the same code.

Question: Why does Telegram reject the S3 URL? How can I correctly send files from S3 using sendDocument?

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