I have created a service account tu use with gsuite
gsuiteApplicationScope : I use serviceAccountKey to connect to google
I have shared files from my Google drive to this service account
find files and folder : retrieve shared files is OK and i can retrieve the id of the file
when i try to download the file with the previous id : the download is ko and the error message is : : Object reference not set to an instance of an object.
thanks for your help