https://play.google.com/store/apps/d...ectsfree&hl=en
Redirect pro version free today with code "appgratis"
Never thought I would use but its pretty nifty, I set it so all pictures will go to my SD (Burst mode saves on internal storage by default and cant change it)
Also set so all downloaded pictures from Zedge or download folder will go to a specific folder on my external SD.
Probably lots more you can do with it to organize better.
I would recommend Whitelisting the folders you want to utilize, and not use the blacklist function because it will move every single file you specified in all apps to the folder you specified, which would be very messy.