URGENT: Cant adjust MIME TPYE from binary/octet-stream

[Kiremit]

I’m trying to upload an MP4 video to WhatsApp Business Cloud in n8n, but the MIME type is set as binary/octet-stream, and WhatsApp rejects it. How can I change the MIME type to video/mp4 within n8n? I tried using Set and Edit Fields nodes but couldn’t find an option. Any workaround?
Chekc the screenshot. This is the way I receive the file.

This is my workflow.

• n8n version: 1.69.2
• Database (default: SQLite): QLite
• n8n EXECUTIONS_PROCESS setting (default: own, main): own, main
• Running n8n via (Docker, npm, n8n cloud, desktop app): self-hosted in google cloud
• Operating system: Windows10

[solomon]

You can try using a Code node for that:

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