|1. If you have the correct rights you can copy that file into that folder on the server. Whether or not it will have the desired affect is questionable. You don't mention why you want to do it so I can only answer that.|
2. Anybody who has access can yes. But, access depends on whether or not their user account, or a group they belong to has access to said folder.
3. If the server's hostname and IP are correctly configured in DNS then using the hostname of the server should work. Also, the IP address should work too. W
Whether or not any of this will work is beyond me. I have no familiarity with the software you're using. Hopefully someone who does can give you better answers. But from a strictly networking standpoint, I've answered as best I can.