The OneNote offline error could be due to the last app update that might have messed up the syncing. Download the latest update for the OneNote. For UWP (Universal Windows Platform) OneNote app,...An example might be tagging some saved portion of text as being "Important." Another feature will let end users preview Office files that get saved using the OneNote App for Windows 10.
Select the photos, videos or files that you want to view and tap on Save button at the bottom. Then a pop-up window will appear. Just click on the Save button at the upper right corner. Step 3. Save the selected OneDrive files to Android. The files will be saved in the "Download" folder on your Android phone.