The only reference about "SMPK 4230" is
this one, which seems to be some pocket-size media player. Looking at the specs, it has SD card slot, so you have to check with the manual whether you can copy media between SD and internal memory.
The other way is to connect it to a computer with standard miniUSB cable, and copy media files over. Depending on what kind of phone you have, you could plug UTG USB cable into your phone, and connect the SMPK to the phone, then copy files.