I bought a wireless mouse that requires a USB piece to be connected. I also use an extra display monitor with my MacBook. If I plug the USB piece into the monitor (that has a USB port), would I be able to drag that mouse onto my MacBook screen while screen sharing/mirroring?
If you plug the mouse's USB receiver into a hub port on the monitor, you will need to ensure that the monitor has an upstream USB link to the Mac.
If you are using a USB-C (DisplayPort) connection (USB-C to USB-C) or a Thunderbolt to Thunderbolt connection, the cable that carries the video will often act as the upstream USB link, as well.
If you are connecting a cable to a DisplayPort, Mini DisplayPort, or HDMI port on a monitor, that cable will not carry USB data, and you will need to run a separate USB cable (see monitor manual) from the monitor to the Mac to hook up the monitor's hub ports.
If you plug the mouse's USB receiver into a hub port on the monitor, you will need to ensure that the monitor has an upstream USB link to the Mac.
If you are using a USB-C (DisplayPort) connection (USB-C to USB-C) or a Thunderbolt to Thunderbolt connection, the cable that carries the video will often act as the upstream USB link, as well.
If you are connecting a cable to a DisplayPort, Mini DisplayPort, or HDMI port on a monitor, that cable will not carry USB data, and you will need to run a separate USB cable (see monitor manual) from the monitor to the Mac to hook up the monitor's hub ports.
Maybe, maybe not. It depends on all the equipment. What model MBP do you have, what is the exact make & model of the external display and how is it connected to your MBP? And ... what is the make & model of the wireless mouse?
IMHO it would be better to use a bluetooth mouse that can connect directly to your MBP.
External mouse and monitor display
