How to configure slicer upload on Mainsail with multiple printers?

[GatoMiopia]

I've recently got more printers and I'm having a hard time to configure them.

My setup consists of 1 Sovol SV06 Plus klipperized and 1 Ender 6 klipperized running on the same MKS PI.

I've managed to install klipper and moonraker for both on the PI, but mainsail only installed one instance. So I used the printers tab to put them all together in one external mainsail instance I have on a home server.

The problem is I can't seem to find any documentation on how to do file upload from the slicer to each individual printer.

If anyone knows or has any source/documentation on how to do that I'd be happy to take a look at.