So we know that you're really you and that you're opening an account with Clanq in your own name, you need to verify your valid ID document. All you have to do is hold your ID up to the camera when you're asked to do so during account opening.
A suitable ID is:
Passport
Identity card
It doesn't have to be an ID from Switzerland. Even with a different nationality you can open a Clanq account. Additionally, you will then also need a residence permit.