Stash currently supports syncing with Handy devices, using funscript files.
In order for stash to connect to your Handy device, the Handy Connection Key must be entered in Settings -> Interface.
Funscript files must be in the same directory as the matching video file and must have the same base name. For example, a funscript file for video.mp4 must be named video.funscript. A scan must be run to update scenes with matching funscript files.
Scenes with funscript files can be filtered with the interactive criterion.