I bought a Sandisk 32GB Ultra OTG pen-drive yesterday and it was working fine, as in would allow me to both read/write through my Moto G(2nd Gen).
Last night, I plugged it into my Samsung Galaxy note Gt N7000, just to check if it can read files too and it could read/write without batting an eye. Today when I tried to move a video file to the OTG storage using my Moto, it would give me an error saying "the following items have not been pasted". Basically, I am unable to write anything to my OTG using the Moto G. It works fine with the GTn7000 though. I cannot understand what might be causing the problem.
I tried formatting the OTG to FAT32 with default allocation size and that too was unable to solve the problem.