after putting a lot of effort in a half-hour-video I wanted to export it. However, I always get the same message, translated from German: “Your project has several missing data. Please save the project, close it and re-open it. Shotcut will try to repair your project.” Unfortunately this doesn´t work. And if I ignore the message, which is possible, the download doesn´t work.
I want to add that while starting the project, I already get a warning, that some data are missing. I even get offered a list of mistakes, but if I click on them a window opens which shows data from the Download-folder. It doesn´t help because the missing data apparently cannot be found this way. At least I can open the project and can work with it. But the export problem remains.
It cannot magically know about every file on your computer. You must navigate to a directory that might have it. You can go row-by-row to choose a replacement for each, but you must find and pick the file yourself. It does not need to be the exact same file, but it is usually better if it is. Otherwise, this dialog has a search button where you can choose a folder, but you need to at least navigate to a likely folder. It does not magically know which folder to search, and you can try more than one folder.