Dropbox is A cloud-based document storage system of choice that easily syncs with all of my team's computers and provides simple access controls to third-party contributors. 

*This is an affiliate link. If you choose to purchase after clicking the link, I may receive a commission at no extra cost to you. Only products I use are recommended because I believe they are genuinely helpful and useful. Have a look yourself, and see if  you believe it will help you too. Enjoy!