You can use the Files app Import photos and videos on iPod touch.
View the contents of the drive or memory card: In a supported app (for example, Files), tap Browse at the bottom of the screen, then tap the name of the device below Locations. If you don’t see Locations, tap Browse again at the bottom of the screen.
Disconnect the drive or card reader: Remove it from the charging port on iPod touch.
Note: The Lightning to USB 3 Camera Adapter can be powered with a USB power adapter. This allows you to connect USB devices with higher power requirements, such as external hard drives, to iPod touch.