The Analyze -> QML Profiler Options -> Load QML Trace file dialog is only accepting files with the extension qtd or qzt, but it does not tell you so.

This is especially bad, because the qmlprofiler tool does not enforce this suffix when creating trace file.

Please either make sure that the needed suffix is visible for the user in the file dialog or at least add an "any file" filter.

Checked on macOS and KDE.