Sorry, this issue is not related to plugin, but related to Php.ini setting:
https://secure.php.net/manual/en/ini.core.php#ini.post-max-size
post_max_sizeintegerSets max size of post data allowed. This setting also affects file upload. To upload large files, this value must be larger than upload_max_filesize. Generally speaking, memory_limit should be larger than
post_max_size.
The right setting should be:
memory_limit> post_max_size> upload_max_filesize.