I have a problem with a video call. My client wasn't able to see me. I tried to click on the Camera Icon, restarted my computer, nothing worked. Sometimes my incoming calls have no sound, and I miss it. Please help!
It is essential when you have to educate your client to talk to them directly.
If you have already been hired by this client, then I suggest you just don't worry about this.
Use Zoom, Skype, GoToMeeting, FaceTime or anything else that you and the client feel like using.
You tried a tool that didn't work for you, and you aren't required to use that tool with actual clients. So there's really no reason for you to try to sort out issues with Upwork's built-in tool.