The Quad format has been sunset and is no longer supported.
However, the format is simple, similar to an SBS, but instead of two horizontal views next to each other, it’s 4 horizontal views with two views stacked on top of the other two.
Views are captured / positioned in the following way:
1 2 3 4
But in the Quad format, the 2x2 is laid out like what’s shown below as a single frame:
1 2
3 4
Just make sure _2x2 is at the end of each filename.