Yesterday I went to open Lightroom mobile app, realized I must have accidentally deleted bc it wasn't there so I re-downloaded it from the apple App Store and was prompted to update the app. After it re-downloaded I logged in with my email via Facebook and once it opened LR there were no photos and all of my presets that I had uploaded were gone. Please help me restore!
Do you have a Lightroom subscription, or are you just using the free mobile app only? If you do have a subscription, then you need to ensure you are logged in using your Adobe account ID, then all your data should download from your Adobe cloud. But if you don't have a subscription, then if you have deleted the app from your device then all the content (which would be stored only on that device) is also removed. In which case, do you have a backup of the device either in iCloud or iTunes?