* Check which thumbnail is used by a file with ''gio info -a 'thumbnail::path' <file.png>''

  * Here a [[https://raw.githubusercontent.com/SKefalidis/DBusSharedThumbnailRepositoryCreator/main/sharedx.sh|script to generate shared thumbnails]] for a specific folder: (AS well linked in the UCA Wiki)
  * Start tumbler from source with debugging enabled
      * Build & install tumbler
      * killall tumblerd
      * rm -rf $HOME/.cache/thumbnails/*
      * G_MESSAGES_PREFIXED= G_MESSAGES_DEBUG=all /usr/local/lib/tumbler-1/tumblerd
  * Monitor tumbler DBus 'Ready' signals: 

  dbus-monitor "interface='org.freedesktop.thumbnails.Thumbnailer1',member='Ready'"

  * Monitor tumbler DBus 'Error signals:

  dbus-monitor "interface='org.freedesktop.thumbnails.Thumbnailer1',member='Error'"

  * Monitor tumbler DBus 'Finished' signals:

  dbus-monitor "interface='org.freedesktop.thumbnails.Thumbnailer1',member='Finished'"

  * Monitor tumbler DBus All signal:

  dbus-monitor "interface='org.freedesktop.thumbnails.Thumbnailer1'"

  * Check some mandatory attributes of the thumbnail via ''identify -verbose <thumbnail.png>''
      * Thumb::URI
      * Thumb::MTime
  * Checksum:
      * The checksum used for the thumbnail name is build from the absolute URI of the file to thumbnail. It can be generated like this:
      * Command:

  echo -n file:///home/my/photos/me.png | md5sum
  
  --> c6ee772d9e49320e97ec29a7eb5b1697.png


    * Detailed documentation can be found here: https://specifications.freedesktop.org/thumbnail-spec/thumbnail-spec-latest.html#CREATION