From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric S Fraga <e.fraga@ucl.ac.uk>
Subject: Re: Overlay in beamer?
Date: Wed, 30 Apr 2014 16:10:24 +0100
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	(Giuseppe Lipari's message of "Wed, 30 Apr 2014 14:27:41 +0200")
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To: Giuseppe Lipari <giulipari@gmail.com>
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[...]

> I tried several options, for example this one:
>
> --------- begin-snippet-------------
>
>   #+ATTR_BEAMER: :overlay <1>
>   [[ file:figure1 ]]

[...]

The following works for me:

#+beamer: \only<1>{
[[file:figure1.png]]
#+beamer: }\only<2>{
[[file:figure2.png]]
#+beamer: }\only<3->{
[[file:figures3.png]]
#+beamer: }

Not pretty but...
HTH,
eric
-- 
: Eric S Fraga (0xFFFCF67D), Emacs 24.4.50.2, Org release_8.2.6-923-g233c11