REST API send_file decode64?

[korenron]

Hello ,
I have created a RESTAPI server using Flask that send me a file by request

ZipLocation = '/home/pi/logs/Data.zip'
return send_file(str(ZipLocation), as_attachment=True)

everything work and I get a working ZIP file

now I need also to upload the file as base64

I have try many thing

 
        try:
            with open(str(ZipLocation), 'rb') as files:
                encodeFile = base64.b64encode(files)
          
        except Exception as e:
            print(e)
        else:
            return send_file(attachment_filename=encodeFile)

but it doesn't work
I get this error

a bytes-like object is required, not '_io.BufferedReader'

have also try this

try:
            test = request.files[str(ZipLocation)]
                encodeFile = base64.b64encode(test.read())
            except Exception as e:
                print( e)
        else:
            return send_file(attachment_filename=encodeFile, as_attachment=True)

and here I'm getting :

400 Bad Request: The browser (or proxy) sent a request that this server could not understand.

what did I do wrong? missing ?

Thanks ,