The device actually has two nano-SIM slots, but one of the slots is shared with a microSD card slot. This means that you can either use two SIM cards or one SIM card and one microSD card.
The Motorola Moto G84 5G does not support OTG (On-The-Go) function directly via the USB-C port, at least there is no official information that this function is available.
The Motorola Moto G84 5G has two nano-SIM slots, but one of these slots is hybrid, which means that it can be used for either a second nano-SIM or a microSD card. So there are not two separate slots for nano-SIMs and an additional slot for an SD card, but a hybrid slot system that can accommodate either a second SIM or a microSD card.
Thank you very much for pointing this out. We will be happy to pass this on internally to the responsible department and hope that this will be adjusted promptly.
Unfortunately, we don't have any personal user experience, but I'm happy to pass your question on to the Community, maybe someone can give you some advice.