Attaching a File in Yahoo
How to send separate files as an attachment:
1. Start a new message or reply to an existing message.
2. Below the message text box, click Add/Delete Attachments.
3. From the resulting Attachments window, click Browse and select a file.
4. Click Attach File. You may attach a maximum of three files. The combined attachments may not exceed 1.5 megabytes.
5. Click Done.
6. Finish the message and click Send.