I got my smartlife bulbs and smartlife fan running with Smartthings following these instructions
If the device itself doesn’t show up, when you create “tap-to-run” actions in the smartlife app (smartlife version of scenes), those tap to run actions come into Smartthings.
However, they come in as “offline” devices, and you have to create virtual switches that toggle the “offline” switches with webcore or smartlighting.
It was a pain to setup, but has been working reliably since I set it up.
All these came over for me