If you have a “spare” computer that can be run 24/7 you might download the Amcrest Surveillance Pro client program for Windows/Mac and basically have your own DVR for all you camera’s. I ended up buying the Amcrest NVR but you can get the same capability by running the client software on a PC. It has amazingly features that far exceed anything you can do on SmartThings. My only regret so far is that I actually purchased the Samsung SmartCam that is compatible with SmartThings and it turns out is not compatible with standard protocols used in CCTV.
This works real well with all the high end features of your Amcrest ProHD (I personally have a couple of that exact model you have) Go to Amcrest Desktop Applications then clik on Amcrest Surveillance Pro menu item