As a content manager, I want a standardised filename structure for all uploaded files so that I can easily sort, search, and organise content due to lack of native folders or tags.

• Filenames follow the structure and are validated on upload:
  [Category]-[Subcategory]-[DescriptiveName].[ext]
• Structure enables alphabetical sorting by category/date.
• Include in done criteria for all content upload tasks.
• Updated existing files.