Unable to Scroll on iPhone

My prototype works on Desktop, but it doesn’t scroll on iPhone, (it scrolls on Android)
I’ve seen some 2019 message about changing “Original size (100%)” to “Scale to fit width” would help,
but it doesn’t.
Is this a known BUG? How do I fix it?
(I can’t use Axure if users can’t scroll),
PLEASE HELP!

Thx
Bins