Min File Size

Reject files that are too small. Set a minimum file size to prevent empty or trivially small uploads.

<core-upload asp-upload-url="/api/upload/upload"
 asp-min-size="10KB"
 asp-multiple="true"
 asp-progress="true">
</core-upload>

A floor as well as a ceiling

asp-min-size rejects files below the size you give, evaluated in the browser so nothing is transferred. It accepts a readable string such as '1KB' as well as a byte count.

The accident it catches

Zero-byte and near-empty files are almost always a failure upstream — an export that died, a capture that was interrupted, a placeholder that never got filled in. Accepting them means the problem appears much later, in whatever tries to process the file, where it is far harder to trace back.