Can I use a free version to transfer? I'm using a free version and when sliding the Upload All to "ON" it didn't ask my username and password on Dropbox. It then slide back to "Off".
Should I use the pro version?
First you need to set up an account in the configuration menus before the sliders can be activated. Also PRO and Free version have the possibility to use the 'Upload All' function. It is recommended to use PRO version because it offers way more features than the Free version.