When installing Enpass on Windows, and setting up the first vault. It only show OneDrive and Google Drive as options to connect to. And it forces you to connect using one of the two, in order to get into the app. So if your existing vault is on Dropbox, you have to first connect to OneDrive or Google Drive, finish the vault setup, then add another vault that connects to your Dropbox, and then disconnect the primary vault that you created during the setup. This is very bad for usability - it should allow you to connect to the other providers as well during setup.

It seems there might be some confusion in the setup process. Here are the correct steps to set up Enpass:

1. On the welcome screen, click on "Personal."
2. Enter your registered email to activate your account.
3. Once activation is complete, you will see all cloud sync options on the next screen.
4. Select Dropbox as your preferred cloud service.
5. If you already have data on Dropbox, it will prompt you to enter your master password to proceed.

Following these steps should help you properly set up Enpass with your existing data on Dropbox. If you encounter any issues or have further questions, feel free to ask for assistance. We're here to help!