How to send the submitted data and uploaded files as a post to a web page?

Need form that allows submitter to describe an item for sale and attach a photo.  The description and photo of the item would then automatically post to a web page.

Thanks!

You would need to add the File Upload field to your form in order to allow your users to add the image, the description could be a text area field, you will find both fields under the Form Tools section in the Form Builder:

Now, you are able to get the data using the POST method allowing to handle the data as you want, you will find more details about it on this guide: http://www.jotform.com/help/213-Send-POST-Data-From-JotForm-Using-PHP-in-Custom-Thank-You-Page. 

Hope this helps.