Using the Google Drive SDK Client API, how to get a public URL of a file in order to present it on an existing website, directly (not "downloading" it)?
Use the getId() method to retrieve the fieldId property.
$image_embed_url = "https://drive.google.com/uc?export=view&id=" . $current_file->getId();#view url
$image_embed_url = "https://drive.google.com/uc?export=download&id=" . $current_file->getId();#download url
Alternate quick method for public single file sharing:
Using webViewLink() (didn't work for me, returned empty)