I often used the context menu in Windows Explorer (Windows 7) by right clicking on a file and sharing the file via Google Drive. Now that Google Drive has been replaced by Backup and Sync, I no longer get Google Drive options in the context menu when I right click (as of March 12 2018). In my Backup and Sync preferences, I have "Show file sync status icons and right click menu" enabled but still see no options on right click in Windows Explorer. Are these options no longer available or can I activate them?
I solved this problem using a method I found on this thread on Google product forums.
I had to register the context menu DLL manually by running Command Prompt in administrator mode and calling:
regsvr32 "C:\Program Files\Google\Drive\contextmenu64.dll"
Somehow the update from Google Drive to Google Backup and Sync disabled this and registering it again solved the problem.