That's a nice looking USB cable, with Ferrite cores on both ends too, very nice. Are you playing through UAPP on the M15 using the D90 MQA as the DAC? I haven't tried that yet myself, although I have thought about doing it someday.
I use the M15 / D90 MQA each connected to my PC and my PC runs the "player" software - Tidal, Amazon HD, youtube, PowerDVD, etc and the M15 is put in USB DAC mode - so I don't see the Android ecosystem while in USB DAC mode.
On your D90 MQA display I see it is detecting 192khz and MQA source, so that's good.
The distortions might be settings you have default in UAPP, you should check the USB settings, set Bit Perfect Mode to On or "When possible", I have mine set to "When possible", Up Sample off (at least for now), Limit Sample Rate "no limit",
Sorry, gotta go, will check back later and finish - basically check those settings and maybe limit sample rate a bit at first - I don't think you need an OTG cable as the D90 MQA is registering sample rate and detecting MQA.
I may try it myself later as I have both the M15 and D90 MQA - and a cable, but I'll have to take things apart to try it