You could use the wallpaper package (
https://ftp.cc.uoc.gr/mirrors/CTAN/macros/latex/contrib/wallpaper/wallpapermanual.pdf
).
Put the following in your YAML block:
header-includes: 
  - \usepackage{wallpaper}
  - \addtolength{\wpYoffset}{12cm} 
  - \ThisCenterWallPaper{1}{logo.png}

Change logo.png to whatever you logo is called (make sure it's in the same 
folder as your txt file) and adjust the Y offset to a value that gets the 
logo in the required position. You can also change the scale factor {1}. 
On Wednesday, 23 December 2020 at 23:38:58 UTC+2 LRP wrote:

> I'd like to center a logo before the title on my PDF title page.
>
> I found a recipe on the web using \usepackage{titling} in the metadata, 
> but it failed. Can some kind soul show me how?
>
> Many thanks,
>
> LRP
>

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