I’m building a custom samplemap editor / instrument builder inside a scripted UI. The goal is to let users drag audio samples from Finder onto a ScriptPanel keymap, preview where the zones will land, then drop them to import and map the samples.

Single-file drag and drop is working well. I’m using:

Panel.setFileDropCallback("All Callbacks", "*.wav;*.aif;*.aiff", function(f)
{
    if (f.hover)
    {
        // update keymap preview from f.x / f.y
    }

    if (f.drop)
    {
        // import f.fileName
    }
});

The problem is multi-file drag/drop from Finder. When I select multiple audio files and drag them over the scripted panel, HISE rejects the drag and the files fly back to Finder. The callback does not seem to fire, so I never get a chance to inspect whether f.fileName is an array.

I tried:

• *.wav;*.aif;*.aiff
• *.wav,*.aif,*.aiff
• *.*
• *
• a narrow *.aif test with only .aif files selected

Single-file drop works, but multi-file drop still gets rejected before the callback. The docs say f.fileName should be an array if more than one matching file is dropped, so I assume this should be possible from script.

What I’m trying to reproduce is similar to HISE’s native SampleMap Editor behavior: drag multiple samples into the map, then choose a mapping mode like Drop Point, Filename Token Parser, etc. I don’t need to invoke the native dialog directly, but I do need the scripted panel to receive the full dropped file list.

Questions:

• Is ScriptPanel.setFileDropCallback() expected to accept multi-file drags from Finder on macOS?
• Is there a specific wildcard format or callback level required for this?
• Does multi-file drag only work from HISE’s internal file browser rather than Finder?
• Is the native SampleMap Editor using a different internal drag/drop path that isn’t exposed to scripting?
• Is there a workaround, eg. folder drop, Broadcaster, FloatingTile, or using the Sampler/SampleMap editor API?

Any guidance would be hugely appreciated.