Telegram Desktop, Shutter Screenshot Tool, and Tomboy Notes are examples of apps with tray icons. By default, GNOME 3.32 does not show them at its top panel system tray. This may greatly reduce your productivity. To show them once again, you can install TopIcons Plus extension and they will show. Special to Telegram, you need to install Ubuntu AppIndicator extension as well. Alternatively, if you wish you can use KStatusNotifierItem instead.

On GNOME Tweak Tool, you can configure TopIcons Plus so the group of icons show right on left side of GNOME's system tray. The formula is Tray horizontal alignment=Right and Tray offset=4 like picture below.

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Do you find your Shutter Screenshot Tool not showing at system tray, and it quits when you close the window? If that so, then perhaps you missed a package when installing Shutter. Just install the missing package and it's done:

sudo apt-get install libgtk2-appindicator-perl

Bonus: if you want to install Shutter with minimal packages download, while having the image editing and tray icon features, just run following command:

sudo apt-get install shutter libgoo-canvas-perl libgtk2-appindicator-perl

Have fun taking screenshots! And thanks Mario Kemper for developing Shutter.

Do you want to move the GNOME Shell default hidden bottom-left system tray to the top-right on the top panel? If so, then TopIcons Plus extension by phocean is for you. This will make any of your tray application shows its icon always on the top panel.