Can anyone recommend cloud storage or online media storage that works well with PLEX or a completely different online media server that works with Amazon Drive?

Sorry if this is a n00b question, I’m running out of hard drive space fast and wondering if anyone uses cloud storage for their media with PLEX or if there are better options out there. I currently have Amazon Drive but I’m open to switching. I just don’t want to have a computer that needs to constantly be connected online with hard drives. Any help is much appreciated! Oh and the easier the setup the better!