It is rather obvious that this simplest recommended way which also provides the simplest API for reading the files from a drive folder ―
from google.colab i
A simple solution for shared files is to add them to you Drive by right clicking on the file in the 'shared with me' list in Drive and selecting the 'Add to Drive' item. Afterward, the file will appear in /content/drive/My Drive/
/content/drive/My Drive/