How to set custom vibrations on iphone

Go to Settings

Go to Sounds

Scroll down to "Sounds and Vibration Pattern"

Select a "notification" (for example I chose ringtone)

You already have a couple pre-made vibration patterns you can change around with

Or scroll down to create your own custom vibration

Tap to start recording

After you're done, you can replay it or redo

Click save, and give it a name

And then it will appear for you to use for any type of notification