For installation instructions, please visit app page on flathub at https://flathub.org/apps/details/com.elsevier.MendeleyDesktop
In order to use LibreOffice plugin, please do the following steps:
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Open LibreOffice Extension Manager at Tools > Extension Manager or Ctrl + Alt + E
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Locate Mendeley Desktop extension at
/var/lib/flatpak/app/com.elsevier.MendeleyDesktop/current/active/files/extra/share/mendeleydesktop/openOfficePlugin/Mendeley-{version}.oxt
or~/.local/share/flatpak/app/com.elsevier.MendeleyDesktop/current/active/files/extra/share/mendeleydesktop/openOfficePlugin/Mendeley-{version}.oxt
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Install it
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Note: If using LibreOffice from flatpak, you have to allow it to access /tmp from host, i.e.
flatpak override --filesystem=/tmp org.libreoffice.LibreOffice
Reference: https://blog.kukuh.syafaat.id/2018/LibreOffice-and-Mendeley-Desktop-Flatpak/