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If they signed up with Keystore I'm not sure you should tell them to immediately start using Keychain (as it's better to let them get some familiarity with Hive first).

But when they are ready, they just copy/paste their Seed Phrase that they saved during the Keystore signup process into Hive Keychain where Keychain asks for "Master Password"

It will then import their Hive Private Keys to Hive Keychain

Okay, I recall you talked about it yesterday at the show. Thanks.

I'll

There's a challenge here.

She clicked the media picker to import Keystore but it didn't work.

here's the reply I got from her

Aunty, I don't know if my phone is too small to open it
At some point, it attempt to log in and immediately go blank and hang.

Whfy to do next? She already downloaded seed phrase.