Hi @jessepalser and welcome!
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Yes, with the sys.save() function you can store data between sessions. Of course, if the user clears the data from the cache, it’s gone.
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The cloud build system is only used if you add native extensions with C++/Objective-C++/Java code to your project. If you just use the standard engine, it’s prebuilt.
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We have a few libraries on the asset store which will allow you to easily add ads support to your project.
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You currently need a Mac to be able to bundle for iOS. We have a ticket for adding support to do it on other platforms but that’s not in our near future.