Setting Individual File Permissions for Documents Used in Microsoft Teams - HLS Show Me How

Hi,

I am using Teams to teach classes.  One of my students thinks s/he will not have to do the work if s/he deletes the files with the documents in the shared folders in the Channel.  Is there a way to prevent members from having the ability to delete files they did not post? 

It seems like a really difficult question that no one can seem to answer with any kind of certainty. 

Thanks.