Preview vs. Publish

After publishing(updating) my app and then opening it, a lot of data is missing and stuff i deleted before the update is still there in the published version.   Please help
1 answers

I think you answer is here:

“Previewing your app does not change the published app. Also, the preview environment has a separate database from the published app, that means you can create your own test data without polluting the data in the published application.”

I hope this helps.