Files App does not open Office files with the r...

I have just updated my iPhone and iPad to iOS11.

Now when I choose any Excel, Word or Powerpoint file, even Numbers, Pages or Keynote file stored in iCloud in Files App, it tries to copy to Google Drive instead of opening the file in the correspondant app (i.e. Excel).

Is it possible to set which program to be opened with each type of file in Files App? I have all Office and Mac apps installed.