Vivo X90 series is expected to make its way to the global markets on January 31. As Vivo prepares for the launch, more details about its leaked foldable smartphone have surfaced online. While the Vivo X Fold, which was recently upgraded to the Vivo X Fold+, has yet to see a global launch, there’s more news about another foldable device with a smaller clamshell form factor. Called the Vivo X Flip, the device will be the second model with a…