In our daily use of smartphones we will notice that the correct functioning of (old) third-party applications is not always intuitive, sometimes even for experienced users; below we will detail several methods to ensure that they work (properly).
Usually, connecting an (external) monitor is a “plug and play” process and does not require any intervention or advanced knowledge, it is enough to assemble it and properly insert the power and data (video) cables. If we do not find ourselves in this situation, below I will list some possible reasons for the “out of the box” failure.