huawei p9 lite (emui 4.1.1, Android 6.0) default gallery app add I try to change the default gallery app on my p9 lite mobile. I found the Default app settings menu, where I can override the default settings. But my problem that I installed an app (total commander) and I want to use that app for gallery, but unfortunately that is not on the list.

How can I add an app for that list? Or how can I set installed Total commander for default gallery app?

Thanks for the answers in advance!
Total commander is not a gallery app! It's is a file explorer. How do you expect it to be listed as a gallery app. 

You can use QuickPic as an alternative gallery app instead.