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You have to have the JSON file. No place to use the private seed phrase unfortunately. It is confusing when you first get going with Keystore.

And no way to create this file for an existing wallet where I have the seed phrase? It would be top if it was possible!
(I'm still not at my computer.. few and far between these days)

!BBH

you would have to ask Khal.
do a thread and ping him.

There might be a way or they can add it to the list.
LeoDex improvements are a big big focus right now.