bug (resolved) with "Mount drive" web-button in colab. Accessing "shared with me" files from google colab (y2020, previous solutions seem to fail) - google-colaboratory

Question

[ Newer Edit]: colab team reported that they corrected the issue on May 27 2020.
I have checked - it works Okay for me now.
Link to issue: https://github.com/googlecolab/colabtools/issues/1205
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[New Edit:] It became clear that problem below arises ONLY if mount the google drive to colab by via web interface button "Mount Drive"
and does NOT appear if mount by command line way.
So seems web way is bugged. See details in my own answer below.
It is checked for "Chrome" browser.
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[Original question:]
How to access "shared with me" from google colab ? (Interface seems changed now (2020) and previously described solutions does not seem to work).
More details:
The question has been asked several times, and
the solutions described e.g. here : https://stackoverflow.com/a/53887376/625396
The problem that I do not see "Add to My Drive" , but see "Add shortcut to Drive".
After doing it, we can see that via web-interface for google drive, that shortcut indeed appears.
BUT that shortcut canNOT be seen via colab utilities, like
os.listdir() !
So shortcut seems to be invisible for colab, and not clear how to access it.
Below are the screenshot, showing that colab does not see the shortcut to "shared with me"-"cytotrace_datasets", but web-gui of google drive can see.
Here is screenshot what I see by colab (shortcut canNOT be seen):
Here is screenshot what I see by web-gui of google drive (shortcut can be seen):

Answer 1

Brief: do NOT mount google drive by web-interface button "Mount drive" (it is bugged), but do it in the "old" command line way, and you will not have problems.
Details:
After getting excellent answer above and playing with it,
it seems I found some strange thing which results in simpler solution and probably indicates that there is currently a bug with mounting the google drive by the web interface button "Mount drive".
I mean do NOT mount the drive by interface:
But do it in the old way:
and that is all - you will get the access to files which added before with the help of
"Add shortcut to Drive":

Answer 2

Suppose you want to read a shared csv file from drive. You have done "Add shortcut to Drive".
1) At Colab Notebook Connect to your drive.
# Import PyDrive and associated libraries.
# This only needs to be done once per notebook.
from pydrive.auth import GoogleAuth
from pydrive.drive import GoogleDrive
from google.colab import auth
from oauth2client.client import GoogleCredentials
# Authenticate and create the PyDrive client.
# This only needs to be done once per notebook.
auth.authenticate_user()
gauth = GoogleAuth()
gauth.credentials = GoogleCredentials.get_application_default()
drive = GoogleDrive(gauth)
2) Get the id of shared file you want to access.
Open file
-> go to linksharing [https://drive.google.com/open?id=1JKECh3GNry6xbAK6aBSzQtSntD4GTEl ] -> copy the the string after 'id='
3) back to colab
# A file ID looks like: laggVyWshwcyP6kEI-y_W3P8D26sz
file_id = '1JKECh3GNry6xbAK6aBSzQtSntMD4GTEl'
downloaded = drive.CreateFile({'id': file_id}) #important
print(downloaded['title']) # it should print the title of desired file
downloaded.GetContentFile('file.csv')
#Finally, you can read the file as pandas dataframe.
import pandas as pd
df= pd.read_csv('file.csv')
Note : This is my first ever answer to a stack overflow question