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How can I upload images or files to strapi using graphQl

How can I upload images or files to strapi using graphQl.

I'm using Cloudinary as the image provider. The strapi admin panel works fine, uploads the images to cloudinary. But, when using graphQl mutation I get an error.

This is the mutation I've tried


`''' mutation {
      createProject(data: {
        title: "$name",
        description: "$description",
        completed: $completed,
        start_date: "$startDate",      
        end_date: "$endDate",
        project_logo: upload(file: $projectLogo){
          name
        },
        publishedAt: "${publishedAt}Z"
      }){
        data{
          id,
          attributes{
            title,
            description,
            completed,
            start_date,
            end_date
          }
        }
      }
    }''';`


I'm using flutter to pick the image and the graphql plugin to send the mutation. The image projectLogo is of Uint8List? 

when I Try-Catch the error, this is what is showing

`EXCEPTION=> Error on line 8, column 29: Expected an object field name
  ╷
8 │         project_logo: upload(file: [137, 80.....])`