Why can't I transfer data from my tablet with OTG support to my phone with USB?
At least one of the USB devices would need support for host-mode USB - which is a hardware feature and therefore can't be upgraded via software - and the other needs to report as mass storage USB device.

Since your tablet has OTG (=host-mode USB) support it may be a simply compatibility issue. Bluetooth may be an option, but it's slow.