"data/HERO \u2013 Blender Grease Pencil Showcase.webm": {

\u2013 appears in content.json if the optional bigfile's name contains space hyphen space.

```
-
```

Start by examining the reported content.json entry and the optional bigfile name containing " - ". Trace the code that generates or parses content.json, then verify that filenames with space-hyphen-space no longer produce a malformed entry.

索引モデルが issue の本文から書いたものです。