You'll have to change the ini settings in the cpanel UI, not upload you local ini file to production.
There maybe more than one problem,
- your combined file size is maybe more than max_upload_size
- Number of files exceeds max_file_uploads
In both the cases follow this: https://chemicloud.com/kb/article/how-to-increase-the-max_file_uploads-limit-in-cpanel/
It's also wise to increase other limits like max post input size etc, to match your max file upload limits.