There are two methods You can add a Shelly device into Your Wi-fi and App/Account
Method 1 is solely by using the app.
Method 2 is by using the Shelly device embeded Web interface and type in Your Wi-fi credential directly on the device. (The App is still needed to pair device to you account)
Pros and Cons
Method 1: The App Pros:
Easy and qucik.
All is done with the app.
Automatically Disable AP and connects to the cloud (If not disabled).
Cons:
You have no control of what’s happening.
If something goes wrong, you often have to do to af full factory reset.
Sometimes gets a Failed to include error.
Method 2: Through the web interface Pros:
You can add Your device in a much more controlled way.
You don’t need the app.
You get acces to update the firmware without the app.