Transferring data to a new iPhone after the initial tranfer

brianne174 Said:

"Other than manually transferring them, can I transfer just the passwords info from one phone to the other?"

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Try Another Transfer:

If things were unsuccessfully transferred 100%, then try it once more. QuickStart is what to use here: Use Quick Start to Transfer Data to a New iPhone or iPad - Apple Support

brianne174 Said:

"How is the 'quick start' option accessed once the new phone is already set up? And am I able to transfer only the keychain data, or will it re-transfer all my previous data and wipe out the content I have created since the transfer (it has been a few days)?"

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About Quick Start Transfer:

I'm not so certain you successfully can. So, try performing the Quick Start. As for what would be transferred, see here, many items would.

See this link, as well: Transfer Data from your Previous iOS or iPadOS Device to your new iPhone or iPad - Apple Support

brianne174 wrote:

How is the “quick start” option accessed once the new phone is already set up?

Sorry, you can't. You would have to erase the new phone and start from scratch.

And am I able to transfer only the keychain data, or will it re-transfer all my previous data and wipe out the content I have created since the transfer (it has been a few days)?

Basically the same answer, sorry. Quick Start is all or nothing.

This article may help you:

Make your passkeys and passwords available on all your devices with iPhone and iCloud Keychain - Apple Support

If the backup was on your computer and you didn’t encrypt the backup passwords were not included.

If you have 2 factor authentication for your Apple ID and you have the same Apple ID on the old and new phones, on the old phone go to Settings/[your name]/iCloud and turn on Keychain. Then do the same on the new phone, and the passwords should transfer through iCloud Keychain.