Why is "on tap" not showing up?

Access to your file is restricted, but on tap interaction is available only if you choose any mobile device in prototype settings. Probably you didn’t.

I changed the permission to “anyone can edit”: https://www.figma.com/design/KmeDMxmPVcziLtkf3Uz8Dt/Legal-Criminal-Defense?node-id=0-1&t=Cl2vVIJ2o7xIgFkE-1

I checked your file, the problem is just like i said — no mobile device is selected.
The width of your mobile frame is 402 px, so you need to select iPhone 16 Pro here

Can you please help me understand why there is no “Content Proptery” option? I have attached a screenshot

It’s here in UI3

How do I download UI3? I downloaded the newest Figma update. Was that included?

Yes, it included in the newer version. Can you share a screenshot of your interface?

Here.

You already use UI3 — the newest version of Figma interface

You claim that I already use UI3. So, please see the attached screenshot and explain why the top version looks different from the bottom version. His version says “create component property” and mine says "create property or variable. Also, he has the options “Name and Value”, while my options are “Create Property, Name, and Value”. However, my value option has a slider, and his value option has a text field where he can type, “Menu button”.

Because he use old UI, but you use the new UI. I’m already posted the screenshot, you pressed the wrong button. You need to click button on top. Or just change the UI to old one.