For now, we can only see one promotion per build (in the build result gadget as well as in the build itself).
The last promotion overrides the previous one in the build view and the gadget.
It would be nice to be able to see all the promotions of a finished build at a glance.
It could take the form of a drop-down menu, or, better, promotions could be displayed next to each other.
Could it be considered by your team for a future update please? It would make our life easier as we use multi promotion builds a lot and can't access them esaily.