A flow should be able to change the permission of an item in a SharePoint List/document library; this is a very popular pattern in Sharepoint workflows
The following two actions should now be available:
1. Grant access to an item or a folder
2. Stop sharing an item or folder
Please check out these new actions in the SharePoint connector and let us know if you have any feedback!
Can we update these to work with SharePoint Groups and AD Groups?