Apple has tested multiple iPhone fold prototypes but concerns happened

According to dylandkt, Apple is currently working and testing multiple iPhone Fold prototypes that contains obviously the foldable displays but still has too many problems to its foldable technology and other concerns regarding to its technology.

There are concerns about if the foldable smartphones will continue to have a place in the market or will just die. And so, Apple is carefully observing the market to see how it goes, improving their product to prevent the same mistakes as their competitors, and making sure that the design is not the same version as the iPhone.