Dragging a folder into uploader creates separate models for all files

[Floppy]

That's "correct" behaviour, but confusing. We should either forbid dropping a folder, or detect it and create a single model from the result.

[Floppy]

There's another possibility; if people drag folders, we might get the folder name in the original path, so we could actually use it to make a new model with those files. Iiiiiiinteresting.