I captured 300 pictures 10sec each of NGC6888 planetary nebula. The nebula is deeply red. With the Deep Sky Stacking feature, it returned green stars to me and no nebula anymore. Tried it again some times, even with only 10 pictures, but it is still not working. And there were some other stacking problems.

The auto-enhance while stargazing produced a beautiful picture, but I wanted to stack again to get rid of the satellites passing by that were on 15 photos.

Everything right out of my S50. Uninstalled the app, latest firmware was already installed.

Unedited with 310 photos in the stack:

Unedited with 40 photos in the stack:

Last 2 pictures from that stack:

S50 Stacking not working for nebula?