Accessing broken Nexus 6

Since I cannot comment on existing posts yet to get the answers I need there: My Nexus 6 screen shattered, and the USB port on the phone might be damaged. I managed to get it to charge eventually, but my PC can't recognize my phone. "The last USB device you connected to this computer malfunctioned, and Windows does not recognize it." I have an OTG Cable, so in theory I can click things on the phone, but (even though I don't have to enter a passcode to unlock the phone) I can't access it via PC after it is unlocked. In a clever attempt, I put a USB 4 port extension on the OTG Cable and connected a USB to HDMI cable (so I would have a display) and a nano receiver for a mouse and keyboard (so I would have control), but I'm not able to see anything on the monitor. Even if I connect the USB to HDMI cord directly to the OTG Cable, then I'm still not seeing anything on the monitor. I know the phone works (as my old alarms went off this morning), but I can't speak to if debugging or WIFI is working (as I moved and its different WAPs). I did happen to get another of the same phone, and (as that screen isn't made anymore,) I could switch the screen from the new phone to the old phone, but then I'd have to switch it back. I would appreciate it if someone could offer an alternative to get files off of that phone.