I am making a file upload bot for slack . Since fileUpload got depreciated , i was using 3 step process of getting the external URL , uploading that URL and then completing that file upload.
Error recieved is

./main.go:62:19: api.GetFilesUploadURLExternal undefined (type *slack.Client has no field or method GetFilesUploadURLExternal)

./main.go:62:57: undefined: slack.GetFilesUploadURLExternalParams

./main.go:116:16: api.CompleteFilesUploadExternal undefined (type *slack.Client has no field or method CompleteFilesUploadExternal)

./main.go:116:56: undefined: slack.CompleteFilesUploadExternalParams

I am getting error in the following functions(error red line is coming under bold line):

func getUploadURL(ctx context.Context, api *slack.Client, filePath string) (string, string, error) {
    fileInfo, err := os.Stat(filePath)
    if err != nil {
        return "", "", fmt.Errorf("error getting file info: %w", err)
    }

    resp, err := api.**GetFilesUploadURLExternal**(ctx, &slack.**GetFilesUploadURLExternalParams**{
        Filename: filepath.Base(filePath),
        Length:   int(fileInfo.Size()),
    })
    if err != nil {
        return "", "", fmt.Errorf("error getting upload URL: %w", err)
    }

    return resp.UploadURL, resp.FileID, nil
}

and

func completeUpload(ctx context.Context, api *slack.Client, fileID, channelID string) error {
    _, err := api.**CompleteFilesUploadExternal**(ctx, &slack.**CompleteFilesUploadExternalParams**{
        Files: []slack.FileSummary{
            {ID: fileID},
        },
        ChannelID: channelID,
    })
    if err != nil {
        return fmt.Errorf("error completing upload: %w", err)
    }
    return nil
}

also , main function is

func main() {
    api := slack.New("TOKEN_BOT")
    ctx := context.Background()

    
    filePath := "example.pdf"
    channelID := "CHANNELID"

    // Step 1: Get upload URL
    uploadURL, fileID, err := getUploadURL(ctx, api, filePath)
    if err != nil {
        fmt.Printf("Error getting upload URL: %vn", err)
        return
    }

    // Step 2: Upload file to URL
    err = uploadFileToURL(uploadURL, filePath)
    if err != nil {
        fmt.Printf("Error uploading file: %vn", err)
        return
    }

    // Step 3: Complete upload
    err = completeUpload(ctx, api, fileID, channelID)
    if err != nil {
        fmt.Printf("Error completing upload: %vn", err)
        return
    }

    fmt.Println("File uploaded successfully!")
}

i have also tried

api := &slack.Client{
        token:"TOKEN_BOT",
        
    }

O-auth permissions are :-

channel:read
chat:write
file:read
file:write
im:read
im:write
mpim:history
remote_files:read
remote:files:write
remote_files:share

I do not understand why is it being considered undefined , with it being part of the latest file?can anyone please help?