Right, it worked as intended insofar as the global state updated (from the receive folder that was actually set as “send&receive”) but the local state on my server is unaffected, and it didn’t delete my files. So as far as I am concerned the “send only” setting is functioning properly.
I actually read for some reason that clicking “Override Changes” would cause the server to override its local state with the global state and then broadcast that global state out to all other clients. What is the purpose of "Override Changes" button? Here it says: " Override changes tells the master to take the global version of all files, increment it by one, and advertise it to everyone"
I didn’t want the global state of course, so I thought that clicking the button would cause my server to delete any extra files it had in its local state, so I didn’t click the button.
I actually went a different way and I just deleted the folder and recreated it on the server. Once it finishes scanning I am going to add it on the client machine and hopefully everything will work out.