I'm trying to add additional folders in the gallery for a Nextbook. It came with three default folders. However, I'm wondering how to go about adding folders to the Nextbook. Any assistance would be greatly appreciated.
Use a file manager, like ES File Explorer. Go to the DCIM folder and create new folders inside it. Name them what makes sense to you for your purposes. Put pictures in whichever folder is appropriate for the picture.
Gallery will show them in those folders (mostly, it's not perfect - sometimes it'll show two "folders" for one folder you have on the tablet).