Default Automatically copy or change save folder

Hi, I recently tried to flash my Verizon GS4 with the latest update but I failed so, anyway, I did back up most of my data but there were a few things like pictures that were in my internal memory that I didn't save. For example, my Whatsapp folder and my saved photos from Facebook automatically save to my internal memory. I looked to change the settings to direct where I want to save the images/documents but I did not see any option in those apps.

I was wondering:
  • Can I change the automatic download drive/folder so that everything goes to external memory?
  • and/or, can my external memory automatically copy everything from my internal memory that is downloaded synchronously?