Google Sign-In and email aliases

I would like to report a usability issue related to Google Sign-In and email aliases, and propose an enhancement.

I have:

• One Google account with multiple email aliases.
• One long-standing Dropbox account created with one of these aliases (let’s call it alias@domain.com), with its own Dropbox password.
• The same underlying Google account also has a “main” address (main@domain.com).

What happens today:

• My Dropbox account email is set to alias@domain.com.
• If I try to log into Dropbox using “Continue with Google” and select my main@domain.com identity, Dropbox creates a completely new, empty Dropbox account for main@domain.com instead of linking the Google login to my existing Dropbox account.
• This behavior is consistent with the current requirement that the Google email must exactly match the Dropbox account email to use Google Sign-In. [help.dropbox](https://help.dropbox.com/account-access/google-sign-in)

What I would like to achieve:

• Keep a single Dropbox account.
• Be able to:
  - log into that one Dropbox account with email + password (using alias@domain.com), and
  - also log in with Google Sign-In using the same underlying Google account (main@domain.com), without creating a separate Dropbox account.

Feature request:

1. If technically and security-wise feasible, I’d like to request:
   1. A way to explicitly **link an existing Dropbox account** to a Google account for Sign-In, even if the Google address and the Dropbox email differ (for example main@domain.com ↔ alias@domain.com), possibly via a confirmation flow on both sides. [help.dropbox](https://help.dropbox.com/account-access/google-sign-in)
2. Clearer safeguards to **prevent accidental creation of a new Dropbox account** when a user mistakenly uses Google Sign-In with an email that already corresponds (directly or via alias) to an existing Dropbox user.
3. An advanced “login methods” section in account settings where a user can:
   - see which Google account is linked,
   - link/unlink a Google account,
   - continue to use email + password in parallel.

This would greatly improve the experience for users with Google aliases or complex identity setups, and reduce accidental account duplication.

Thank you for considering this request.