Lightroom Mobile was recording on my micro SD card, but at some point I needed to use this card in my gopro.
I've then started lightoom on my phone, but without my SD card in. It then shown me an empty catalog, which makes sense. I took a couple of pictures, then at the end of the day, I put the micro SD card back inside the phone.
I then restarted lightoom, changed the settings for lightoom to use the SD card as storage again. LM mentioned it was moving everything to the SD again and then would restart.
I saw that my catalog was back there , but without more than 300 pictures that I had taken during the previous 2 months! Unacceptable.