i have an android and ios application which is getting bigger and i would like to migrate it to app42 cloud. I currently use mySQL with php services for all the data stored in the database. I wan't to import the mySQL database to my app in App42. I tried going to Storage - JSON - Import and selecting a .json file which has my data, but the system upload it as a file and not as a collection. Is there a tutorial on how to migrate from mysql to app42?