Default [Q] how mount micro sd card in 3g dongle

i have Huawei e3531s-1 3G dongle which support micro sd card. My 3G dongle working fine with PPP Widget,but i dont know how mount sd card or view sd card in nexus 7.i tried OTG Disk Explorer but no luck.
Thax in advance
Nexus 7 on stock rom (4.4.3) and rooted