This is what i had to do for the 26933 to work in the new app with the DTH of @MichaelS Long but do not skip any line.
For a device to work with the new Samsung Connect app (2018)
Login to https://graph-na04-useast2.api.smartthings.com
My Device Handlers
Click on the Namespace/Name to modify is code
After the field :: author: "xxxxx" add these word: , vid: "generic-dimmer"
It will become: author: "Michael Struck", vid: "generic-dimmer")
Publish For Me
To do on EVERY Devices who use the DH / Device Handlers that you just edit
Click on the : Display Name to update
Update (if you received an error “Access to graph-na04-useast2.api.smartthings.com was denied” close the webCoRE tab)
That’s it for the web page
On your phone you need to clear the cache of the App
(“translate from my french Android Phone, if someone can give the good word, i will edit my post)
Find SmartThings (Samsung Connect)
Delete data, back, back…
Open SmartThings (Samsung Connect) and WAIT for the app to load all your device.
Give a like if it worked…