Actual Result:
After sending the "hi" message narrator is silent, not reading anything when message is in Sending state.
Narrator is not providing any information about the sent message.

Note: Same issue repro at -
Upload File button - After Uploading Image narrator not give information that Image has been uploaded.
Attachment -"Usable_Image uploading Information".

Expected Result:
Narrator should provide the information about the sent message.

Repro Steps:

1. Open URL https://microsoft.github.io/BotFramework-WebChat/full-bundle in Edge browser.
2. Notice 'Upload File' and 'Send' button icons present in bottom of screen.
3. Open Narrator (Caps+Win. Key+Enter)
4. Type 'hi' in the input control at the bottom of the screen and hit enter (or click on the send button) .
5. Observe that Narrator not is not providing any information about 'Sent' message.

User Impact:
Users depending on screen reader might get confused as screen reader is not providing information about the action.

Test Environment:
OS: Windows 10
OS Build: 17134.345
OS Version: 1803
Browser: Edge
Tool: Narrator

Attachment:

1. Usable_Messgae sending state.zip
2. Usable_Image uploading Information.zip