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And moreover, what about when the attachment is actually a ZIP archive with multiple files; will those be indexed?
At the moment, we only support text-based files that are in the supported content types. ZIP isn't a text file, so it won't be indexed. If text in a user mail is indexed, and the user clicks on that mail and sees a zip file, it isn't really the result of Copilot or Semantic Index, but a secondary resource. For more info on what content types the index supports, check out this article https://learn.microsoft.com/en-us/MicrosoftSearch/semantic-index-for-copilot#enablement