If you have a HifiMan HM-60x or HM-801, try the OTG cable with your Samsung Galaxy phone or Tablet.
I got both my HM-601 and HM-801 to work with the USB DAC input with an OTG USB adapter with my Galaxy Note 10.1.
Be sure to power up the HifiMan player and connect the USB cable and OTG adapter before plugging into the Samsung Galaxy. Otherwise you might get the "High Power USB" error.
Sure it seems a little silly to hook up an external DAC to Samsung Galaxy phone or tablet, but it does sound a lot better.