This was really a productive time to build this product ,but we also got stuck sometimes:
. The dicussion pannel was not easy as it took time to connect and ws receiving late messages. Even was not secure.
. Video conferencing was not as smooth, as it was lacking in voice and even the video
. Uploading files also took time.
. Sharing screen took a lot of time as it was not received by everyone.
. Error handling was taking time.

But at last we were able to solve all the above problems.