When you sign in to Lightroom CC on your desktop, the following message is displayed:
Upgrade Required For Lightroom Mobile
Lightroom must be upgraded before it can continue syncing with Lightroom mobile.
Adobe has recently made some upgrades to Lightroom's back end cloud server, which enables syncing photos and edits between Lightroom for mobile clients and Lightroom CC on your desktop.
If you are using Lightroom CC 2015.4/Lightroom 6.4 or earlier, update Lightroom to the latest version to continue syncing with Lightroom for mobile.
- To know your current Lightroom CC version and how to install the latest updates, see Keep Lightroom up to date.
- To know how to set up and use Lightroom desktop to sync photos with other Lightroom mobile clients, see Sync Lightroom across desktop and mobile platforms.