Screen Missing only in published app

Hello everyone!

I have finally reached a point with my Adalo app where I could publish it and carry out internal testing for it. However, from the get-go I stumbled unto a hurdle, once I download my published app the first screen I see is “screen missing” and nothing more. I can see the welcome screen and home screen in Adalo`s app builder, I can see it when I preview the app there, but once it is published all I get is “screen missing”. I was hoping maybe someone could help with this problem?