I know how to share a site and share documents on our Sharepoint Online team site. There is a lot of documentation showing how to do this. One thing I cannot find is how to remove someone from being shared to. In addition, I have not found any info on how to change someone's shared permission. If they have Edit level permission and I want to change them to Read Only, how is that done? Or if I want to remove them from accessing that file, how is that done?