The ability to use the player while connected to USB and charging is technically nothing to do with OTG and even my humble ATJ2085 & ATJ2097 players are able to do this by pressing the Menu button to drop out of the charge screen.
OTG is the ability for a player\device to act as a Host (Master) to another USB device (Slave) such as a pendrive, some cameras, other players etc.
The Player (Host) is able to access, read, write, delete and initiate transfer of files between itself and the other device (Slave).
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