...
Enhanced editor:
Share Files in a Chat
Collaboration on files is possible in a Chat, use the paperclip icon to browse your computer (G or H drive access) or OneDrive. Shared files are stored in the folder 'Microsoft Teams Chat Files' within each chat member's OneDrive for retreaval either from the 'Files' tab in the Chat or via OneDrive.
Extend Chat with video, audio, screen sharing or adding users
...