Download images, GIFs, videos, and voice messages on the Telegram webapp from private channels that disable downloading and restrict saving content
< Opiniones de Telegram Media Downloader
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Please confirm that you have enabled the developer mode for the extension you are using.
From the installation guide:
Important: If you are using Tampermonkey extension in a Chrome-based browser, following the instructions here to enable Developer Mode.
https://www.tampermonkey.net/faq.php#Q209
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