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Even the most ancient eReaders work as storage on my oldest Android phone, a Sony-Ericsson.
Make sure the "host end" is at the phone. Double check with a regular cable and a OTG adaptor, which are just passive wired, or with a different slave device to test cable.
The ability or not of the ereader to support OTG is irrelevant as it has to be the regular USB client or slave. The phone has to be the host.
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