Scrolling a QFileDialog is difficult on Android. It is not easy to hit the scroll bar. Therefore when trying then there is a good chance to hit a file entry within the list instead. This wouldn't be any problem if the list would scroll the android way. But it doesn't. Instead the list entry ist moved (Drag&Drop instead of scrolling).
If the list entry is accidentaly released over a directory entry then the file is moved there.
This is not what you would expect on android!
Furtheremore because ".." is not shown in this dialogue there is no way to move it back.