I am trying to follow the instructions given to another user (jurjen) by building the following .local/share/applications/.desktop file, and also variations of it. It does not produce any button anywhere. I've done a shallow research on .desktop files to refine a previous version. I am clearly blindly missing the big points.
phablet@ubuntu-phablet:~$ cat .local/share/applications/.desktop
[Desktop Entry]
Version=1.0
Name=web container
Type=Application
Exec=/usr/bin/webapp-container --enable-addressbar --enable-back-forward --webappUrlPatterns=/home/phablet/*/*/* /home/phablet/*/* /home/phablet/* /home/phablet/
Icon=/usr/share/icons/Humanity/actions/32/add.svg
Terminal=false
X-Ubuntu-Touch=true
phablet@ubuntu-phablet:~$