I give up!  I simply want to record to a 128GB SD card, all the time, and have it recycle the oldest video.  I come from using a DCS-936L which had an intuitive Web interface to set this up.  I took the SD card out of the 936L (after disabling its SD recording) and pushed the card into my new 8300LH and rebooted the 8300.  I realize the 8300 has no Web interface so I've tried to figure out the mydlink app interface.  There are Schedules, Events, and Automation settings along with Timers, etc.  I would appreciate some help enabling always-on SD Card recording.  I don't want motion or sound detection, just always-on SD card recording.
By the way - there does not appear to be a motion detection On/Off switch.  How do I know if it's OFF, which is what I want it set to?