The trouble is the GX software doesn't know the generator is feeding the Multi. Quatro's have two AC inputs one for grid and one for generator, but not the Multis.
One of the digital input functions is to tell the GX software if the generator is running but this only changes what notifications are displayed. I have an enhancement that displays the state of the "generator is running" input on the generator overview page and couples it to the generator manual start. However, a lot more work would be needed to make the necessary shift in AC input switching logic.
The GX software would need to be changed to allow for two virtual AC inputs for a Multi and an external transfer switch, then use the "generator is running" digital input to switch to the generator virtual input. This very issue comes up a lot on the forum.
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GX - Generator auto start/stop
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