Why does upload image via camera work on mobile-safari but not as iOS PWA?

Question

I have a webpage with PWA capabilities.

On iOS safari I do get the usual OS dialog asking me if I want to take a photo or upload a picture from the photo library:

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Answer 1

It did not work till iOS 11.3 but all Versions from 11.3 upwards might be okay:

More Details to that can be also found here: How to access camera on iOS11 home screen web app?

I could test with different devices with iOS Versions 11.4+ and confirm: works on those. Not tested with 12 and above though.