In my teaching, and spending time in the Adobe forums I see people struggling with this. They open Lightroom and all the work done on a previous day has some how been lost, and they are certain Lightroom is at fault. Of course Lightroom is not at fault. They've simply opened a different catalog than the one previously worked in.
I recorded this video to explain how to figure out what catalog you have open.
With Lightroom Creative Cloud you can share Collections online, directly from Lightroom. You don't need to use publish services, you don't need a website or hosting service, and you don't even have to export jpeg images. Watch the short video to see how easy it is.
Adobe Mobile applications connect our devices to our desktop applications allowing us to create any where at any time. Most of the traffic between mobile and desktop is routed through the Creative Cloud Libraries. Unfortunately at this time, the mobile workflow primarily runs on a one way street going from Mobile to Desktop with very few round trips available.