Embed and sign any external libs/frameworks to the extension target. The widget will then run without any error. It worked for me perfectly.

Deep linking from widget to parent app is very easy. You just have to configure your small widget with widget URL and other widgets with Link view builder. After doing this, when you tap on your widget or specific tap targets of your widget, your App delegate application: openURL method gets called. Be it swift or objective-C, this method will trigger and you have to handle the logic to show a specific application View controller