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CreateChannelMediaUpload

Reserve a direct upload for an image or video to attach to a channel message; use this for media too large to pass inline, such as screen recordings. Returns an uploadUrl: immediately PUT the raw file bytes to it from your shell with the returned contentType as the Content-Type header (see uploadCommand), then call SendChannelMessage with an attachment whose id is attachmentId and whose kind is the returned kind. The URL must be used within 2 minutes; call again for a fresh one if it expires. Only images and videos are accepted; attach other files by uploading them as documents and passing the document ID.

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