On Tuesday, 21 Jun 2022 at 10:01, M. ‘quintus’ Gülker wrote:
> I am working on a presentation for a conference (using org-mode and its
> beamer export) and want to exchange the entire background for a specific
> frame with an image. This is possible with Beamer, see

This is a bit hacky but see attached file.  The trick is to end the
previous frame explicitly, create the frame with the desired background,
and then start explicitly a new frame but which is not shown in
presentation mode.

The ending of the previous frame is fragile as there may be other
environments that should be closed so you will have to be careful.

Hope this helps.

-- 
: Eric S Fraga, with org release_9.5.3-507-g4f0f24 in Emacs 29.0.50