If you can post a screenshot (sans paypal email id), we can take a look and see what may be the issue.
The Snipping tool, located in the Windows Accessories program group is easy and great for creating an image of the csv file. You may have to create two images to get the entire shot of all of the headings.
Once you have the images, use the 'Photos' tool above to insert into a post. Do not worry if the images are small and hard to read, we can cope with it (usually).
Now, if you do not have access to the csv file created by storenvy, you will have to contact them for help.
eBay is continually updating this site. Some advice given may have changed. Please reply to this thread, to let us know if this advice works for you. The links on the bottom of any eBay page can help you deal with most eBay issues. Contact eBay Customer Service on Facebook.com/eBay or Twitter.com/AskeBay
