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All send methods take a variadic list. Spectrum sends each item sequentially as a separate message: 
await space.send(
  "Here's the file you requested:",
  attachment("/path/to/document.pdf"),
);
This runs one send() per item on the underlying provider. It is not a single compound message. Reach for group() when you specifically want multiple items rendered as one bundled unit.

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Reply with multiple items

message.reply(...) has the same variadic signature and delegates to space.send(reply(...)) internally: 
await message.reply(
  "Thanks for the question.",
  attachment("/path/to/answer.png"),
);
On platforms without thread support, reply() resolves as a no-op. If you need guaranteed delivery, use space.send(...) instead. See Replies for the canonical form.