Issue with uploading documents via API (PowerAutomate)

Hi there,

I am facing an issue when trying to upload documents via Power Automate HTTP request

My input as follows:

Headers

{
"authorization": "sanitized",
"accept": "application/json"
}

Body

{
"title": "Test",
"employee_id": "1602....",
"**category_id": "1638....",
"file": "data;image/png;name=PersonioCert.png;base64,�PNG........."

}

Flow isn`t failing directly. Retrying several times ending with status: "InternalServerError".

Would appreciate any help or hint to solve this.

Thanks in advance!

Marco