You can use the AssistiveTouch feature built into iOS. AssistiveTouch gives you a software equivalent of Home button which can be used to perform a variety of device operations.
To enable AssistiveTouch go to Settings app → General → Accessibility → AssistiveTouch.
Once enabled, you'll notice a gray colored translucent overlay button on your device screen. ...
This solution works for me using Keyboard Maestro.
Steps to do it:
Create a new trigger: name it something like Screenshot Active Monitor
Add a hot key trigger. I use Print Screen button on my keyboard (which is F13). You can use any shortcut that work for you.
Add following actions to execute on the above keypress:
1. Type a combination of the keystrokes ...