Keychain
Not all of my passwords get stored in keychain. It’s unpredictable. Is there anyway to direct that a password be saved?
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If the option to save the username and password does not pop up automatically, you can add them manually in the settings app. Settings>Passwords and Accounts>Website and App Passwords. Enter your passcode for access. Tap the + sign in the upper right. Then enter the information in the text fields.