Is your feature request related to a problem? Please describe.
Attachments uploaded when using MSTeams/Skype can't be downloaded from skills as the token generated by the skill bot is not authorized to download the attachment. Only the parent bot that is present on the same thread where the user uploaded the attachment is able to authorize and download the attachment.

Describe the solution you'd like
MSTeams/Skype should allow the skill bot to be able to access the uploaded attachment using its token.

Describe alternatives you've considered
Parent Bot downloading and uploading the attachment to its own storage and then replacing the attachment URL with its own URL which can be accessible by Skill bot. This adds additional latency and security issues that parent bot needs to handle.