Hi Rozza, thank you very much for your quick reply.
When you refer to “Yes just overwrite the existing.”
I understand it is to upload a new version to the Apple Store and not to overwrite the app in Adalo.
Yes, keep the old Adalo app for now. You are creating a copy of the original, the database should be shared.
When you publish it will get a review, how thorough depends on which way the wind is blowing that day, but if it’s notionally the same app, put an explanation that the overall size may be different due to rebuilding, but the functions remain the same. When it comes to app review, be thorough, lay it out for them, screenshots and video walk throughs are good.