Created attachment 100723 [details] [screenshot of the bug] Hi, I'm using Kdenlive since 2009 and it's the first time I'm meeting this bug: when I'm browsing to add an image to a "title" in the "Title Clip editor" the file browser dialog doesn't show thumbnails of my image. This situation makes the selection of the right picture really tedious and long, because I have to open side by side a file explorer (eg: Thunar/Nemo/Nautilus ) to see the thumbnail, remember the filename, then select the right name after that.
Probably the same as your other bug report: this strongly suggests that your installation is not complete. When thumbnails are missing, this may be pointing in the direction of an incomplete KF5 installation.
Cannot reproduce on Kubuntu with KF5 and proper plasma integration files installed.