When I send video 3gps or 3g2s from my yahoo email as a text message I do not get an attachment to download.

When I use my mobile web browser to access my yahoo sent mail I have a download link but I get a message saying content not supported. The 3g2 I took with my phone, successfully sent to my email, was able to view and download to my desktop, but when I composed a new text message, attached the same clip and sent it back to my phone I received a text without an attachment . I got the same unsupported content error message when I tried using m.yahoo to download the link.

Any suggestions?
Thanks.