I’m having the same problem. I noticed that when I use safari or google chrome on iPhone or safari on MacBook pictures wil not appear in the web browser
But when I download the picture it is visible.
When I use a windows pc or google chrome on my MacBook they do!
The problem is already a view weeks old.
I flash new (and old) software on the sd card,
Checked the voltage on the raspberry and everything else in the support page told me to do.
I also bought a new camera but the new one also didn’t work.
It really matters which browser you use.