Open in Explorer
Our users need to send attachments to clients...not just links. The only way they can do this is to Open in SharePoint, then Open in Explorer View, and then attach the files. That is adding quite a bit of overhead to their daily workflow.
Being able to ATTACH a file directly from Teams, or at the very least an Open in Explorer option would significantly cut down the time they need to do regular tasks.
The file content of a team can be opened in Sharepoint, and then in explorer. Why not allow the user to use explorer from the get go? Moving files in and out of folders in Teams is too difficult because of the web-like interface).
I like the idea of an Open in Explorer option for a slightly different reason than Todd's. For files already downloaded to the device via OneDrive for Business, Explorer is a faster and more powerful file browsing experience than Teams. But if users want to open a file referred to in Teams, they either need to open it within Teams or online (both essentially the same option) redownloading the file that is already stored on their hard drive. They also have the option to navigate by memory to the directory on their device. An "Open in Explorer" button that would integrate with the locally stored, synced files would be great.