How to add an sms:number link to a menu? In Drupal 8.5, when you're adding a menu item, you can add a telephone number by setting the Link to tel:1-555-555-5555.

However, if you try to add an SMS link like sms:1-555-555-5555, it fails validation and says "The path 'sms:1-555-555-5555` is invalid."

What's the easiest way to override this so that I can add an sms link to the menu?
On the sites/default/services.yml

There is an option called filter_protocols

Add sms to it.

If file is not available, copy the file from default.services.yml to services.yml