I recently upgraded my iPhone and when I redownloded and signed into my Lightroom app, all my photos and presets disappeared. I am less worried about the photos and more concerned with the presets. Is there any way to get the presets back?
When you work with Lr as a free customer it's crutial to not re-install the app. Otherwise you will loose the data, since nothing was stored in the Lr cloud. When you update to a new phone you should restore your phone from a back-up of your previous phone version. With that you will transfer+preserve the Lr data. Hope this helps, - Guido/ Lr Mobile QE