David, thanks for getting back to me
I just tested this with uploading the dot-swf file into /portal_skins/custom/ (you could also embed with an absolute URL.)
i selected add file and created a new file called portallogo it points to my flash file
Then I modified the /portal_skins/global_logo by pasting the embed code between these tags
i don't have a /portal_skins/global_logo in my portal_skins folder when viewed from the Zope management console
<h1 id="portal-logo" metal:define-macro="portal_logo"> </h1>
You can add filesystem directories by adding LocalFS objects in portal_skins and then adding those as layers in the properties tab of portal_skins.
I'm new so all the above still has me wondering what the actual URL value is going to be... In my flash tag there are 2 places for urls and in a file based system they point to same url src="http://mysite/myfolder/myswf.swf" I'm still unclear as to the exact syntax to use for the value in src... Thanks for answering I will post to Plone in the future. Site has been down off and on all weekend. -jm