I find it very disappointing that Teams doesn't make use of the features that are being built into Windows, first it was the People Hub which through lack of use seems to be going away. And I'm shocked to still find that I cannot share to Teams from the built-in Windows 10 Sharing experience.
Agree. I share from Teams all the time on my Android phone, and just updated one of the commercial WinForms apps my company ships to our customers to support sharing information using the share contract only to discover Teams doesn't support being a target. Highly frustrating!
Please strongly consider making Teams a share target on Windows 10, just like it is on Android and other platforms.