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Based on my research, when creating a campaign in Viva Amplify, Microsoft’s documentation mentions a size limit of up to 12 MB (12,582,912 bytes) per image used in a publication. There isn’t any official information about other file types or their size limits.
You can refer to this article: Create a publication in Microsoft Viva Amplify - Microsoft Support
From my testing, when a campaign is published through Outlook or SharePoint, the files and media added to it are included in both. Once published to SharePoint, the content will also appear in Viva Connections.
I hope this helps. If I’ve misunderstood your question, please feel free to let me know.
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