Error:

Request body no files data length is larger than the configured limit

Solution:

Increase the limit for SecRequestBodyNoFilesLimit in mod security.

Imunify360

Open

/etc/imunify360-webshield/modsecurity/modsecurity.conf

Update SecRequestBodyNoFilesLimit to a number you prefer. By default, the size limit is 128KB ( 131072 ).

Plesk

Plesk documentation