For others to know, in the meantime we did a testfligh submission with 4 + ODR and it failed with the following message:
ITMS-90559: Thinned app size is too large - The “/Payload/MyApp.app” app bundle in the universal variant is 5 GB, which exceeds the maximum allowable size. After app thinning, if your iOS app contains on-demand resources, the app bundle in any variant must be less than 2 GB. For details, visit: https://developer.apple.com/help/app-store-connect/reference/on-demand-resources-size-limits.
So it looks that if you don't have ODR then your app size can < 4GB, but if you do have ODR then the thinned app size must be 2 GB
Hope it helps someone searching for the same info.
Thanks
AtomAnt
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