HI,
I have a problem with my HTC Desire 816G (MT6592). Whenever I install the Android M ROM, internal storage doesn't mount. My phone's internal storage doesn't appear in USB mode and nor in file manager. Lollipop and Kit Kat work fine. I didn't have this problem with Marshmallow ROMs before. I've been stuck for around 2 weeks now.
this is the rom i installed :-
Name = [6.0.1][STABLE] AOSPA Paranoid Android for HTC Desire 816G (MT6592)
Link = http://www.needrom.com/download/6-0-1stable-aospa-paranoid-android-for-htc-desire-816g-mt6592/