---
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"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/12301#article
headline: "12301: Invalid Upload Content-Type"
url: https://www.twilio.com/docs/api/errors/12301
inLanguage: en
dateModified: 2026-03-11T20:01:16.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 12301: Invalid Upload Content-Type

Log Level: ERROR

## Description

Twilio is unable to process the `Content-Type` of the uploaded file. Please make sure the uploaded file is valid and supported.

### Possible causes

* Unsupported file format
* File is malformed