Method GET not allowed for ACTION.IMPORT

[protector]

I am having an issue with an action that Implemented to Import CSVs.

Locally, it works like a charm, but then when deployed on BTP, I keep getting the error:
GET Method Not Allowed for ACTION.IMPORT.

I am making a post request and not a get. (FYI)

I tested posting a small string, it worked just fine but with the Uploaded CSV “Big string”, I get the error.

Screenshots below:

Frontend upload logic

 

Handler (nodejs)

Action (schema.cds)

Error: