File Uploading issue using "apollo-server-azure-functions" ("Must provide query string")

[imathad]

I have faced some issue after sending the request from the postman

schema : export const types = scalar Upload;

export const queries = ``;

export const mutations = singleUpload(file: Upload!): String!, ;

request : {"query":"mutation SingleUpload($file:Upload!){\n singleUpload(file:$file)\n}"}

result after request: Must provide query string.

please provide me the solution file_upload_gql.pdf