GIF 게시 시 “이미지가 4mb보다 큽니다” 오류 발생

Did you increase the limit in app.yml as well?

As the site setting’s description says:

The maximum image upload size. This must be configured in nginx (client_max_body_size) / apache or proxy as well. Images larger than this and smaller than client_max_body_size will be resized to fit on upload.