First you need to upload your .swf file to your shopping cart via FTP or Other.
After the .swf file has been uploaded make note of it's location in your website and the full string of where it's located.
Once you have the location of your .swf, you can now open up the shopping cart admin panel.
Click on Cart Settings, then go to Edit Text Pages.

When you load the new page, find the page you want to add the .swf to and click the pencil icon to the far right to edit that page as shown below.

Once you've chosen which page to edit you should get the screen shown below.

Scroll down to Page HTML as shown below. It is here that you want to edit the html code to add the .swf that you uploaded earlier.

SWF images require a certain amount of code in order to read correctly in a web browser. One such line of code reads as follows:
<object type="application/x-shockwave-flash" data="yourflash.swf" width="" height="">
<param name="movie" value="yourflash.swf">
</object>
This line of code is for use with logo and picture type files, it requires editing in order to use your .swf files.
