File Sharing from Chrome

Hi. Currently using an AR750. When I connect to the wifi of the box, I would like to go to chrome on my phone to access a page (such as box.com) to download some files on the box. Could someone direct me to the best way to do this?
Thanks

Please check captive portal.
The router has this fuction. It is usting nodogsplash. So you can change the settings.