My LR mobile app hasn't opened for a few weeks now. I keep installing the latest ios updates, restarting, etc. and no luck. I've checked for app updates in the app store, tried opening the app directly from the app store as well. It acts like it's going to open, then just disappears and goes back to the phone's home screen. When I 'scroll' to see open apps, it shows the LR screen (no images, just the logo LR screen) but when I select it same thing again...just acts like it's loading but nothing.
I know I could try deleting and re-installing that app. My question is do I lose all my presets, catalog, photo edits, etc.? I know they're stored separately in the LR computer version but when you try to delete iphone apps it always says you will 'delete all the app's data'. I do not have premium or sync.
Did you install your presets via LR on the desktop? Or did you make them inside LR mobile and are they synced and visible in Lightroom Desktop? If not, do not reinstall LR Mobile just yet -- let us know, and I will ask someone more knowledgeable about presets for next steps.
Great -- my advice above about creating a backup was geared more towards ensuring you don't lose any images. As far as not losing your presets, I hope these will survive after you create a backup on you device and then restore from that back-up. This will reinstall your apps, and should place all the local files your apps use including Lightroom and its presets. It's a cumbersome process, but is the only thing I can recommend for a free Lightroom account was not syncing images and presets to cloud storage before the app became unstable. I am not able to reproduce the crash you describe, so I'm hoping restoring from a back up will smooth out any current application or file system corruption.