Can't see the preview in the edit Frame

[Gleb]

Why frames are not shown in prototype view?

When there are no connections, all frames on the page are shown, you can cycle between them using arrow keys or arrows at the bottom of the prototype view. But when you add connections, only frames connected to the starting frame are shown. Even if you add connections between two frames but there is no way to reach them from the starting frame, they will be unreachable in the prototype view.