Accidentally posted this in the WaterMedia's GitHub (both WaterMedia and WaterFrames have similar names and are trivial to mix up) so I'm posting it here as it's far more appropriate here. I also improved it so it's actually possible (as drag and drop is not possible).

WaterFrames is brilliant but has one critical issue. Since YouTube is engaging in unlawful electronic jamming, I have to use local files. However, local files have these limitations:

1. Every file must start with water://local/ followed by the path.
2. No special characters, not even spaces are supported.

The solution I propose is adding a button to select files which calls up Windows Explorer (or Finder under macOS) to browse files to reduce complexity for the end user.

For the original issue which I backported here, click here.