I’m building a FASTAPI endpoint to upload a file into a S3 bucket with bucket name and path as input parameters. When i don’t specify the file path, the file is getting uploaded successfully. But when i mention the path, the file is not getting uploaded. Please help me to fix this issue.

#upload.py

    from fastapi import FastAPI, File, UploadFile, HTTPException, Depends
    from pydantic import BaseModel
    from typing import Optional
    from botocore.exceptions import NoCredentialsError, PartialCredentialsError, ClientError
    import boto3
    import uvicorn
    
    app = FastAPI()
    
    AWS_ACCESS_KEY = "XXX"
    AWS_SECRET_KEY = "YYY"
    AWS_REGION_NAME = "ap-northeast-1"
    
    
    # Pydantic model for the request body
    class S3UploadRequest(BaseModel):
        bucket_name: str
        file_path: Optional[str] = None  # Make file_path optional
    
    
    @app.post("/upload/")
    async def upload_file_to_s3(
            s3_request: S3UploadRequest = Depends(),
            file: UploadFile = File(...)
    ):
        """
        Upload a file to an S3 bucket.
    
        :param s3_request: S3UploadRequest. Contains the bucket name and file path.
        :param file: UploadFile. The file to upload.
        """
        try:
            s3_client = boto3.client(
                's3',
                aws_access_key_id=AWS_ACCESS_KEY,
                aws_secret_access_key=AWS_SECRET_KEY,
                region_name=AWS_REGION_NAME
            )
    
            # Set default file path if not provided
            if s3_request.file_path is None:
                s3_request.file_path = file.filename
    
            # Upload file to S3
            s3_client.upload_fileobj(file.file, s3_request.bucket_name, s3_request.file_path)
    
            return {
                "message": f"File '{file.filename}' uploaded successfully to bucket '{s3_request.bucket_name}' at '{s3_request.file_path}'"}
    
        except NoCredentialsError:
            raise HTTPException(status_code=403, detail="AWS credentials not found.")
        except PartialCredentialsError:
            raise HTTPException(status_code=403, detail="Incomplete AWS credentials.")
        except ClientError as e:
            raise HTTPException(status_code=500, detail=str(e))
    
    
    if __name__ == "__main__":
        uvicorn.run(app='upload:app', reload=True)