It seems that direct integration between Dropbox and Yahoo Mail may no longer be available. However, you can still share Dropbox files via Yahoo Mail by following these steps:
- Log in to your Dropbox account.
- Find the file you want to share.
- Click the chain icon to copy the link of the folder.
- Open Yahoo Mail and log in.
- Click on "Compose" to start a new email.
- In the body of the email, paste the Dropbox link you copied. You can also add any context or message you want to include.
- Complete your email and click "Send."