Make my external camera (webcam) as default for Telegram Desktop

I have tried the answer of this post:

sudo snap connect telegram-desktop:camera

However, I cannot make my external camera the one which telegram uses in the video calls. I cannot see the option to select the input devices neither for the micro nor for the video.

By default, Telegram only uses the in-build camera of my laptop, but I want to use my external camera instead.

I have the last snap version of telegram and Ubuntu 20.10

I have found the video call settings. It was a matter of selecting the default input video there. However, I think video call setting is a little hide in the settings menu.

Settings → Advanced → Call settings (in system integration section)

In my case I had to go to Settings → Calls → Settings and I could select my external webcam there.