My Imac running Catalina says I don't have read and write access to the hard drive
When I try to grant myself access, it says I don't have permission. I've been having trouble with file sharing between my Imac and my Macbook Pro. Sometimes I can see one from the other and sometimes I can't (actually I can always see them but can't always copy files one way or another). I read something about permissions and in looking at my Imac's hard drive it says the Admin only has read access and my name doesn't appear. When I try to grant Admin read and write access I get a message that I don't have permission. Same thing when I try to add myself to the list. This is happening after I enter the admin password and unlock the icon. My laptop has the permissions set correctly. Both are running the latest version of Mac OS Catalina.
Thanks.
iMac Line (2012 and Later)