I recently got a Mi Box and would to make the external hard drive attached to my DD-WRT router it's default storage location.
I'm able to access it and play media via a SMB share but have only been able to change the default download folder to locations in the Mi box internal memory. (using ES File Explorer)
I would like to avoid buying more usb memory and manually copying things over.
Is there a solution to this?
Where are you downloading from? Google recently released an official Samba Client for Android that lets you access your shares from the system's files application. Maybe you could try sideloading that app and see if it makes your shares visible when you decide what your download location is. The app is listed as developed by Google Marketing, not Google Inc, by the way.