I have a synology NAS 1517+ and I have two 10TB HD set up as a Raid1. I have another 10TB HD that I want to use to house my Dropbox. When I try and do it, it wants to set up to the RAID1 set up. I need help completing this task. I think it's a minor detail that I am not doing correctly. I have a screenshot of what I have done on that particular disk. Please ask questions if you have any.