Hi TerayS,
Thank you for reaching out. My name is Leo, a user just like you. I'd be happy to help you with your concern.
For questions 1 and 2, I recommend trying to reset your OneDrive application to refresh the app. You won't lose any data by resetting OneDrive. Follow the steps provided on this link: https://support.microsoft.com/office/34701e00-bf7b-42db-b960-84905399050c
Then check if it resolves the issue. If not, kindly try adding the folder manually. Check if you have this option. In the OneDrive app, navigate to the shared folder using the "Files" tab. Right-click on the folder and select "Add to Shared."
For number 3, based on my knowledge, I am not aware of any options to receive notifications when there are changes on the drive. As a user of OneDrive, Google Drive, and other drives, I haven't come across a feature like that. I only receive notifications when I am invited to access a drive, not for changes or any additional files added.
Your understanding and patience will be highly appreciated. I hope I provided a helpful information regarding your concern! Let me know if you have any further questions. Be safe always!
Best Regards,
Leo