In the Info property list, control-click at the list to add a row.

Control-click the newly added row and turn on the Raw Keys and Values mode

Update the key to FlutterDeepLinkingEnabled with a Boolean value set to YES.

    

    
       Note:
    The FlutterDeepLinkingEnabled property opts into Flutter’s default deeplink handler. If
    you are using the third-party plugins, such as uni_links, setting this property will
    break these plugins. Skip this step if you prefer to use third-party plugins.

Click the top-level Runner.

Click Sign & Signature.

Click + Capability to add a new domain.

Click Associated Domains.

In the Associated Domains section, click +.

Enter applinks:<web domain>. Replace <web domain> with your own domain name.