Thank you for your continued feedback. We are currently working on this, and recently announced this feature for developers in Beta. For more information, please visit https://developer.microsoft.com/microsoft-teams/blogs/importing-3rd-party-platform-messages-to-microsoft-teams-is-now-available-in-beta/.
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Hello, this article is confusing. https://docs.microsoft.com/en-us/microsoftteams/migrate-slack-to-teams It provides instruction but not clear. It just says copy the file to Teams but how does it copy it, it does not tell. This is misleading to your customers. Do not post out documents that are actually yet to be developed.