Payload Too Large

[sm2017]

I have a 1MB limit for files , When I upload a 200KB file with a field like following

------WebKitFormBoundaryOmz20xyMCkE27rN7
Content-Disposition: form-data; name="data";
Content-Type: application/json

{
  "description": "description"
}
------WebKitFormBoundaryOmz20xyMCkE27rN7
Content-Disposition: form-data; name="file"; filename="image.jpg"
Content-Type: image/jpeg


FILE_DATA
------WebKitFormBoundaryOmz20xyMCkE27rN7

everything is OK and works , But the following has Payload Too Large

------WebKitFormBoundaryOmz20xyMCkE27rN7
Content-Disposition: form-data; name="data"; filename="blob"
Content-Type: application/json

{
  "description": "description"
}
------WebKitFormBoundaryOmz20xyMCkE27rN7
Content-Disposition: form-data; name="file"; filename="image.jpg"
Content-Type: image/jpeg


FILE_DATA
------WebKitFormBoundaryOmz20xyMCkE27rN7

the diffrence is filename="blob" when I set filename for json part I have Payload Too Large error