@Shlomy: Sadly it isn't possible to assign an SD card as the default location for all data, with the exception of photos and videos captured via the Camera app: Open the Camera app > Tap the cog Symbol > Storage > Change from 'Internal' to 'Memory Card'.
If you require the necessary steps to transfer files from your internal storage to your SD card then please confirm your current Android version and I will look into this for you (Settings > About Device > Android Version).
Thank you. Sadly I don't have access to a device with Android 6.0.1, although hopefully the following steps will be applicable. Please open your Apps menu via the Home Screen > Tools (folder) > My Files > Images (as an example) > More > Edit > Tick images you want to move or tick the 'All' box in the top left corner > More > Move > Memory Card > Select folder or create one if necessary > Done