Which LG Signs are supported by Simple Editor

I only have a couple signs, but one, model 55UL3J-MP, is not found with a player search. Is there a support list for Simple Editor. Looking for a simple way to distribute content to my couple of signs.

Or how do I ensure my sign is running the player so that it will be found by Simple Search?

This forum is only for webOS TV apps. Please contact webOS Signage Developer Support. Thank you.