For the past 2 days, My android phone app behaving abnormally. Neither it is syncing with the server nor it is allowing me to upload any files to the central server. When I add any files to the dropbox folder in my windows 10 computer it syncs properly but does not show up in my android app. After adding files directly in the app it keeps saying "Waiting to upload...". Please help me to resolve this issue. I do not use offline files on the android device.