Adding an attachment to a message [gelöst]

With the increasing amount of content around collecting banknotes, which I am thoroughly enjoying, I have been sorting out all of my swap notes and puting them onto a spreadsheet.
I would like to create a new topic on the forum, offering a banknote exchange, but do not know if I can send my spreadsheet as an attachment to anyone who replies.
Any help would be gratefully received.

There is a button that looks like a photograph with a little plus symbol next to "the smiley button" when you create a message, this is how you can upload attachments.

Thank you for your reply. I will have a go later to see if it works. I might send it to you for you to confirm I have done it correctly.

You can only upload pictures in messages but you could opload your list to any filesharing site and send the link

I think I will up-date my own website and anyone interested will have to look there.
Like Idolenz stated, only pictures can be added.