How can I implement a multi-answer multiple choice question?

I chose multiple choice > advanced > allow for more than one answer. However, when I view the form, it doesn't allow me to indicate multiple answers.

Hi, thank you for contacting support.

Could you please share with us the form URL you're currently working on so we can check?

Could you also please provide us more details about your requirements so we can assist you properly?

We look forward to your response.