How are you viewing the saved image? You need to place it over something other than white to see the transparency. If you view it in a browser, it won't look transparent. Create a new image in Photoshop. Add some colored squares - drop in your image into a new layer and you should see it is transparent. The checkerboard background is only in Photoshop and just a way to show you it's transparent.
OK - I just tried this on an artboard and it didn't work - saved the whole artboard. Are you using artboards?
I created a new document for print - no artboards and it worked the way it's supposed to. I don't know why it's different with an artboard - it shouldn't be. You have to generate your images from an artboard.
Put the parts into a group. Rename the group - I named mine test.png. Add the extension .png to the name. Under the file menu - generate - make sure image assets is checked. You'll find a new folder where your document is stored called assets. If you haven't saved your document it will be on the desktop.
Thank you for your input! I totally forgot you won't see the transparency unless it's actually over another image.
I'm trying to create a mouseover effect on a PDF. I was able to do this in Acrobat, but it only worked in Firefox,
neither Chrome or IE displayed the mouseover color. Each product needs an "over" state. The Fireworks image
map I created is swapping images, so the transparency is not showing up. I'm trying to figure out the most
efficient way to do this.
The easiest way is what I described above. Have each rollover version be in it's own layer / group and name them correctly then simply generate. I don't know about making them work in a PDF and I know nothing about Fireworks (why are you still using it??)