[GeoNetwork-users] changing institution logo in geonetwork 2.10

Dear list,

I'm struggling a bit with geonetwork 2.10.
I want to change the default logo for my institution.
I prepare a gif file, which I renamed with my server UUID, something like
[UUID].gif (where [UUID] is the actual server UUID.

I tried to put this gif file in:
/usr/local/lib/geonetwork/web/geonetwork/images/logos
and under
/usr/local/lib/geonetwork/web/geonetwork/images/harvesting

but the logo won't display. I restarted geonetwork in case it would be
cached, emptied the browser cache... the blue default logo is still there.

Could someone tell me if there is another location I should try?
Can you confirm I should name the icon with the server UUID?
Are there some rules for the gif file I must match to let the system
display it?

thanks!
b./