Yes, it is possible to mirror and retrieve data from a USB stick simultaneously via HDMI using the Samsung multiport adapter (USB-C, 3 ports).

- The adapter offers an HDMI interface that allows the screen to be mirrored to an external monitor.
- The adapter also has a USB 3.1 interface, which you can use to retrieve data from a USB stick.

This adapter is compatible with various Samsung devices, including the Galaxy Tab series, and supports these functions simultaneously.