cannot transfer files from my phone to pendrive/HDD via OTG

I run nougat(nrd90m stock+ by tupac4u), I tried to transfer files from my phone to pendrive using otg it works but when I try to transfer files from my phone to the pendrive I get a message in es file explorer saying operation not supported but I can transfer some image or video files! I face same problem with computers running windows too where my devices doesn't show up as a storage device, it only connects with ADB interface!



Thanks in advance! :)

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