You can add attachments any time while you're composing an email.

Here's how to do it:

1. Click Attach (next to the paperclip) above the Compose window.
2. You’ll recognize your computer’s usual file-locating window, not Yahoo! Mail’s. Find the file you’d like to attach.
3. Click Open or OK.
4. You'll see the file name appear above your Compose window. If you want to add more attachments, repeat this process. You can keep adding attachments until you reach the 25MB email limit.
5. If you decide not to include an attachment, click Remove beside the name of the attached file.

You can send many types of files as attachments, including word processor or spreadsheet documents, audio files, image files (bmp, jpg., gif, etc.), web pages saved as HTML files, and more. Your maximum total email size is 25MB.