how can i set my custom address when (pow.ffs.setDefaultStorageConfig || pow.ffs.pushStorageConfig)?

[howlwindy]

step:

1. this is my customConfig, point is config.cold.filecoin.addr:
   {
hot: {},
repairable : {},
cold {
filecoin: {
addr: 'custom addr'
}
}
}
2. await pow.ffs.setDefaultStorageConfig(customConfig)
await pow.ffs.getStorageConfig(customConfig)
3. await this.stuff.pow.ffs.stage(file)
4. Error: t3xao2uyz37sgx5dkyeuaq7n5krabce5tc3khtqmfjcelxt36mjfdkuwnm7tnpjgh6fysujekrpg4qnw5tn3cq is not managed by ffs instance

i wanna know how to set my custom addr to default addr?