Flameshot is missing "Take Screenshot" from Context Menu

[Lonnie Lee Best]

Flameshot is missing the "Take Screenshot" option from its context menu.

sudo apt install flameshot

If you try to launch flameshot in GNOME3, it shows 3 separate launchers:
1) Configure Flameshot
2) Launch flameshot
3) Take Graphic...

After launching flameshot an indicator on the top panel is suppose to provide an option to take a screenshot, but it does not.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: flameshot 0.5.1-2
ProcVersionSignature: Ubuntu 4.18.0-13.14~18.04.1-generic 4.18.17
Uname: Linux 4.18.0-13-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Jan 7 03:15:51 2019
InstallationDate: Installed on 2019-01-06 (0 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: flameshot
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[david23 (david-3791)]

the same is happening to me when using Ubuntu 18.04. With ubuntu 20.04 everything works just fine, though.

[david23 (david-3791)]

At least, I just discovered a workaround: by double clicking on the tray icon, you can take a screenshot.

Instead, if you choose "Take a graphical screenshot" from the menu, you can take a screenshot of the menu itself (i.e., it does not disappear before the screenshot, making this menu entry useless.