Most of the lost data cases are because the user did not back up their data on mynetdiary.com website. Or have created two separate accounts on mobile and web.
If you have created a website account before, then all you have to do is to Sign In with your website credentials into the app to recover your data.
If you have purchased Premium before, please reach out to support@mynetdiary.com - we might be able to help you locate the lost account. If no Premium was purchased, unfortunately, we won't be able to locate the lost account.
That is why it is very important for long-time MyNetDiary and PlateAI users to have an active and linked website account.