Hah, good, you found the long press functionality. I was slightly worried if it was discoverable enough. And I'm not really planning to start writing a manual.

Regarding image and video previews, yes, there's some issues there. I haven't seen exactly what you describe, but I've seen videos playing choppy while showing 0-1% progress, or images not displaying if their size is too big. I'll have to dig a bit deeper in AnimatedImage and related QML types to see if I can poke them in a better way.