Galaxy S7: Original-Samsung Apps installation (better camera app?)

Hello,

Has anyone managed to install original Samsung camera apps has his S7?

Explanation:
OpenCamera does not take satisfactory pictures on the S7.
Additionally, it is unacceptable that the image files are all between 9-12 MB in size. This is out of proportion to the quality.

I have tried to install original apps as APK, which ALWAYS resulted in the error message: “An error occurred while parsing the package”.

Thanks for your comments!
Ralf