Indeed, the gnome-integration plugin was not installed, These integrations seem to be left out of the meta package of the distro and you must download them manually for your desktop.
However, this unfortunately does not apply to Xfce. Installing 'cairo- dock-xfce-Integration-plug-In' on Xfce yields the same results: 'Empty or unreadable Folder' and Bin applet doesn't open the trash folder, "xdg-open trash://" works. But you also mentioned that Thunar is not supported by default? Or should it be when using Xfce-Integration plugin? I have attached the log from using cairo-dock on LM 19.1 Xfce. Thank you for your patience and for solving the problem on Cinnamon. Apologies for the bug report since regarding Cinnamon it's not a bug, just a missing plugin. ** Attachment added: "Full output of cairo -debug on LM 19 Xfce" https://bugs.launchpad.net/cairo-dock-plug-ins/+bug/1888049/+attachment/5395527/+files/log_xfce.txt -- You received this bug notification because you are a member of Cairo- Dock Devs, which is subscribed to Cairo-Dock Plug-ins. https://bugs.launchpad.net/bugs/1888049 Title: Folders not working Status in Cairo-Dock Plug-ins: New Bug description: Cairo-Dock version: 3.4.1 (via apt) Folders version: 0.2.6 Tested on: Linux Mint 20 Cinnamon, Linux Mint 19.1 Xfce The Folders add-on doesn't seem to work. Upon dragging a folder into the dock and importing it's contents, it creates an empty box icon. Clicking on it won't reveal the folder contents. In LM 19.1 Xfce there's the same issue, however there is a message displayed upon importing folder contents, that the folder is empty or inaccessible, though the folder is not empty. Output of 'cairo-dock -l debug' is attached in a text file. To manage notifications about this bug go to: https://bugs.launchpad.net/cairo-dock-plug-ins/+bug/1888049/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~cairo-dock-team Post to : cairo-dock-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~cairo-dock-team More help : https://help.launchpad.net/ListHelp