When a form multipart/form-data is submitted to send a file, if dimension of submitted file to be uploaded exceeds the dimension of MAX_FILE_SIZE value, PHP emit a warning and the $_FILES global is empty.
Warning: POST Content-Length of …. bytes exceeds the limit
In WordPress you have something like:
Warning: POST Content-Length of ….. bytes exceeds the limit of … bytes in Unknown on line 0
https://www.axew3.com/w3/2016/11/warning ... ow-to-fix/