export_channel_snapshot

Start or resume a temporary, read-only ZIP snapshot of a channel. The call returns immediately with export_id. Poll get_channel_export_status, then request a one-time download URL. Date values may be YYYY-MM-DD or ISO-8601. Media is deduplicated and temporary server files are quota-bound and automatically deleted. Downloaded files include byte-detected MIME/extension metadata without replacing Telegram's declared fields. Photo thumbnails reference the original image instead of duplicating it. channel.json includes description, subscriber count, linked discussion chat, snapshot time, and channel avatar when available.

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