Can I control the background App by BTT?

I have already set for certain app like player,

Is there any way to control the media player (background process) by using Siri Remote, while reading documents or using other app?

To help solving the problem, I download the latest version, and I wonder what is "shortcut sending compatibility mode"?

I tried to sending Shortcuts to Specific Applications as well, but it still failed to work.

According to the instruction, it says "you can choose to temporarily bring the selected app to front, send the shortcut and immediately switch back to the previously active application.". Is it the only way to do it?