Here is the link to Adobe's help topic on the subject:
The link doesn't work. The forum seems to be corrupting it by invisibly inserting
In any event, once found, the FM8 Help page does seem to imply that FM8 has transparency/opacity for Frame graphics.
I lately attempted to see if FM9 supported opacity for imported EPS objects with no luck, and someone else was asking in that same thread for opacity in Frame graphics.
I'll be surprised and delighted if FM has transparency support for anything beyond line art.
The images I am working with are line art.
Transparency in unfilled line art generally works for Frame Graphics, vector EPS, probably vector PDF, possibly SVG, and who-knows for vector WMF. The EPS or PDF preview image is always opaque - you have rto check the PDF output to verify.
That is, they are native FrameMaker drawings with fills applied.
That is claimed to work in 8.0 and later, but nobody seems to know how. That same example is in Help 10.0, with no clues as to how the Help author thought such a thing would be created in or imported into Frame.
Poking around in my copy of FM9, I see no tools for setting the opacity of a filled object - a crucial control for overlaid objects. (Actually, I can't even set a fill in my copy of 9.0p255. The fill button does nothing. I can only control the border.)