Uploaded files are not in the Dropbox

I found my mistake! Thank you 

Here I am writing some code snippet. I decalared client as global and created a singleton class. 
I hope this will help you.

import SwiftyDropbox
var clientDropBox = DropboxClient(accessToken: "Put Your Valid access token here.")

class Dropboxmanager: NSObject {
    private  init(client:DropboxClient) {
        clientDropBox = client
    }
    static let sharedInstance = Dropboxmanager(client: clientDropBox)


    func dropboxSessionAndAuthorizationWithVC(vc:UIViewController)  {

        DropboxClientsManager.authorizeFromController(UIApplication.shared, controller: vc, openURL:
            { (url) in
            UIApplication.shared.openURL(url)
            weak var wself = self
            OperationQueue.main.addOperation({
            })
            wself?.downloadFilesInDropBox()

        })
    }

    func getCurrentUserInformation(completion:@escaping (String)-> Void)  {
        // Get the current user's account info
        clientDropBox.users.getCurrentAccount().response(completionHandler: { (response, error) in
            if let account = response {
                print("Hello \(account.name.givenName)")
                completion(account.name.givenName)
            } else {
                print(error!)
            }
        })
    }

    func createFolderInDropBox(){

        clientDropBox.files.createFolder(path: "/TempFolder").response { response, error in
            if let response = response {
                print(response)
                weak var wself = self

                wself?.uploadFilesInDropBox()
            } else if let error = error {
                print(error)
            }
        }

    }

    func deleteDropBox(){

        clientDropBox.files.delete(path: "/TempFolder/File.extension").response(completionHandler: { (response, error) in
            weak var wself = self
            wself?.uploadFilesInDropBox()
        })
    }

    func getListOfFolder()  {
        clientDropBox.files.listFolder(path: "").response { (response, error) in
            if let result = response {
                print("Folder contents:")
                for entry in result.entries {
                    print(entry.name)
                }
            } else {
                print(error!)
            }
        }


    }
    func uploadFilesInDropBox(){

        let strUrl = "URL_FILE"

        let url = URL(fileURLWithPath: strUrl)

        let _ = clientDropBox.files.upload(path: "", mode: Files.WriteMode.add, autorename: true, clientModified: Date(), mute: true, input: url).response { response, error in
            if let response = response {
                print(response)
                CoreDataManager.sharedInstance.deleteAllCoredataObjects()
            } else if let error = error {
                print(error)
            }
            }
            .progress { progressData in
                print(progressData)
        }
        
    }
     
    func downloadFilesInDropBox(){
        // Download to URL
        let strUrl = "Destination Url"
         
        let destURL = URL(fileURLWithPath: strUrl)
        let destination: (URL, HTTPURLResponse) -> URL = { temporaryURL, response in
            return destURL
        }
         
        clientDropBox.files.download(path:"/TempFolder/File.extension", overwrite: true, destination: destination)
            .response { response, error in
                if let response = response {
                    print(response)
                } else if let error = error {
                    print(error)
                }
                                
            }
            .progress { progressData in
                print(progressData)
        }
    }
}