OOPs, For some reason Thought you were talking about youtube through windows PC,,, when you said "Desktop amp" above.
I have used with an OPPO Find 7, ZTE 7 Mini, and LG-G6... Usually use with music via Usb Audio Player Pro... That is one player that gives correct bit rates and very clean audio. Can download from Google Play Store. I like using UAPP; because when listening to music no other phone sounds come through the DFR. (At least with settings I use)...
What other players/apps work through the DF "correctly" from from a phone, without re-sampling, etc , depends on your exact phone. Almost all the Phone Makers like to play around with Android, so they act differently with attached DAC's... Many folks use UAPP to set the "hardware" volume of the DF , and then close it and use other apps/players. Without that, volume can be low on some phone apps through DFB or DFR.
Hope that helps some. Sorry for my missteak above.