Upload file to dropbox using ionic

bonjour

uploadFile() {
this.accessToken = ‘…’;
let headers = new Headers();
let data = {
“path”: “/Homework/math”,
“mode”: “add”,
“autorename”: true,

}
headers.append(‘Authorization’, 'Bearer ’ + this.accessToken);
headers.append(‘content-type’ , ‘application/json’);
headers.append(‘Accept’, ‘application/json’);

return this.http.post(‘https://api.dropboxapi.com/2/files/create_folder_v2’, JSON.stringify(data), {headers: headers})
.map(res => res.json());

}

erreur
POST https://api.dropboxapi.com/2/files/create_folder_v2 400 (Bad Request)

https://api.dropboxapi.com/2/files/create_folder_v2”_body: "Error in call to API function “files/create_folder:2”: request body: unknown field ‘mode’"proto: Bodyconstructor: ƒ Response(responseOptions)toString: ƒ ()

aider moi svp !!!