I use Debian 13 with XFCE4 as desktop environment. The Appearance I chose is Adwaita-dark style and Tango (icon theme) for icons.
I have installed a new app which does not show its icon in the XFCE panel, and I believe it is because this icon does not belong to Tango icon theme, so I want to include the icon between the Tango icons (/usr/share/icons/Tango). I believe I found a tutorial for this some years ago, but I do not find it now. So, how should I do? Where should I place my icon? (among the subfolders [actions, animations, apps...] in any of the folders [16x16 22x22...] in /usr/share/icons/Tango) Shouls I update the Tango database? If so, how? Any other step?
Thanks!