After many hours of research i have to quit my adventure with Adalo.
Adalo is a good tool for make simple app but it’s not what i was looking for.
What i didn’t like is using 3rd-party solution for majority of external collection.
e.g. if user want to upload a photo externally i probably need a 3rd party
if i want external collection to have relationship i need 3rd party.
In my case my client didn’t want to pay for other cost.
Positive thing for me is that Adalo changed my mind so i started to learn a Java language.