Add addFileAttachmentAsModernAttachmentAsync and addFileAttachmentAsModernAttachmentFromBase64Async feature about office-js

[besiler]

Hi @pabloglombovsky , thanks for sharing this idea! You mention attachments, so I think you are thinking mostly (or only) about Outlook and not other office apps--is that right?

We are looking at doing some work to better support file storage and sharing in Outlook, so this suggestion is very timely!

Would you mind posting it here in our feature request forum so others can see your suggestion and vote on it? https://techcommunity.microsoft.com/t5/microsoft-365-developer-platform/idb-p/Microsoft365DeveloperPlatform We might also find if others want similar features for other office products as well.

[besiler]

Closing as a feature request -- will put this on the backlog for Outlook file sharing support and monitor https://techcommunity.microsoft.com/t5/microsoft-365-developer-platform/idb-p/Microsoft365DeveloperPlatform for developer feedback on urgency