Send email to all Shared With

Hi Pavel!

I do not know of any standard functionality for this other than looking at the properties of the document and see which people you have shared it with, and then manually send an email to them.

Otherwise, with some programming, you should be able to write a small script that runs through a specified document (or all documents) in your OneDrive and list the people you've shared the document(s) with.

Here are something that might be useful for You if you choose to code the functionality:

https://docs.microsoft.com/en-us/onedrive/developer/rest-api/api/driveitem_get 
https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/api/driveitem_list_permissions 

Regards, Magnus