we are using HipChat for real time communication and Redmine for everything else, except file storage (because it isn’t very featured in Redmine). As a beginning team, we now feel the need to share content assets between each other.
I personally use perforce in combination with gdrive for such stuff -> on perforce we upload all assets/project and on grdive we organise our documents (GDD, …)
perforce was kinda hard for me and not really intuitive, it’s kinda oldstyle software, if you have someone who is good with it, then it’s ok… but if not… prepare to hit your head a lot in the wall
Back then when I was just getting familiar with game development I was working with a few friends of mine and we used to share our files on a premium Mediafire account we had. It was very simple, safe and clean. But now as it’s already pointed, I think Google Drive would be your best option as you don’t have anything more than 1TB to share for now. But get the perforce running if you are serious about what you are doing.