In my app, I have set up the sdk with the right token, I can make other query, however When I try to upload a file to a column on a board, it hits an internal server error.

my code as following:

 const file = await fetch('/images/test.pdf').then(r => r.arrayBuffer());

console.log(file)

const query = mutation {add_file_to_column (item_id: 1844256842, column_id: "files", file: ${file}) {id}}

  try{

    const response = await monday.api(query)

    console.log(24, response)

    

  }catch(e){

    console.log(e)

  }

error message as follow