That's a common issue. You need the documentsui.apk. See "Questions & Answers" Q20 of my "General FYT based Spreadtrum uis7862 (unisoc ums512) - Q&A, Mods, tips, firmware" threadHi, I've been using my new Navifly 7862 device for a few days now, and it's fantastic.
However, I have encountered a couple of problems which I hope you will help me solve.
Reading the external USB and app permissions
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