Welcome to Android Central! I'm not sure exactly what it does, but the "lge" part means it's an official system app from LG (lge means LG Electronics). So you don't have to worry about it being malware.
That is not what they asked.
With all the shady crap going on with every app down to but not including the basic weather app selling our location and other data,
What is LG Upsell and why was it put on our phone with what is clearly the name of a tracking program?
I saw that it was 75kb but that means nothing.
So as op asked, What is LG Upsell and why is it on our device.