I have done this in the past but I can't now. Same pc, same email client, same ISP, just doesn't work now.
My ISP is ATT, I have DSL the lowest speed, I use web based Yahoo! Mail, my browser is Firefox 3.6.24.
When I compose an email and click on the "attach" icon, it opens a window that I can chose whatever I want to attach, in this case it's an Open Office doc (doesn't work with pictures or a MS word doc I have either) then I click on the document to highlight it and chose select or open (either works) but then the result is the attachment has a red triangle with an ! in it next to the attachment and in red it says "1 files can't be sent". Next to that it gives the option of try again, remove all or report a problem.
No matter what I select to attach I get this error. I have "tried again" many times with the same results. I reported the problem 5 days ago and heard nothing so far and wonder if I ever will. In the mean time I can't send a word doc I need to.
If I click on send I get a message that says “There were problems uploading some of your attachments. Please remove them from the attachments list and try again ” and it will not send the email.
I used Yahoo! Help but it tells me nothing. I'm stymied.