FormData 无法与 Expo CLI React native 一起正常工作

Question

recently I got an issue with uploading documents functionality in Expo CLI - React native, the issue is the file is not delivering to the backend like FormData() it arrives in a weird array, not like the website at all, I got the same endpoint connected to React JS project and it works fine and the browser delivers the documents correctly, But not sure what is wrong with FromData here, I also tried react-native-fs but it's not compatible with Expo and here is my code

                    let formData = new FormData();
                formData.append('file', doc);
                let token = this.props.user.token;
                let header = { headers: { 'Accept': '*', 'Authorization': 'Bearer '+token, 'Content-Type': 'multipart/form-data' } };
                let res = await axios.post(BackendURL+'/porta/files/upload/'+document.projectDocumentId, formData, header);
                if(res.data.success === true){
                    alert('File uploaded successfully');
                    this.props.ReloadData(true);
                }
                console.log(doc);

Answer 1

Issue has been solved, the problem where in the header, i removed the content type & accept like this

                    let formData = new FormData();
                formData.append('file', {
                    name: doc.name,
                    uri: doc.uri,
                    type: "application/pdf"
                });
                this.props.loadingStatus(true); 
                let token = this.props.user.token;
                let header = { headers: {  'Authorization': 'Bearer '+token } };
                let res = await axios.post(BackendURL+'/portal/files/upload/'+document.projectDocumentId, formData, header);