content: I typed out a huge VERY IMPORTANT note on my phone came back and it was gone with an error There are conflicting changes on this page. Try opening it with OneNote Online to see conflicts. I did that and it didnt help. I have only ever opened that notebook from the app on my phone and had just created the notebook in the past day or two so not sure how a conflict occurred. App is pointless actually counterproductive if saving doesnt work properly and notes are completely lost.