How can I change my email download setting on my S7?

[AC Question]

I received an email with attachments for the first time since getting my S7 and I ended up clicking on the Dropbox to view and now I can't figure out how to change it. I don't attachments saved to my Dropbox I want it on my phone. Any help would be great.
Thanks

 

[STARGATE]

Go to settings
Applications
Default applications
Set as defaults
From there, choose Dropbox, Clear defaults.
That's it!