Dropzone multiple uploads returned 403 forbidden

I'm implementing multiple upload for 25 files at once using Dropzone and Laravel.
On my development server, the code runs well. 25 files, all successful.
However, on my production server, 5 files are ok. More than 5 files, there will be few returned with 403 Forbidden error.

I already configured php.ini

upload_max_filesize = 50MB
post_max_size = 50MB

and the tested files didn't reach 5MB actually.

There is no LimitRequestBody setting in httpd.conf.

The form is included with @csrf.

Where else should I look into?

After couple of days, I came across this line in apache modsec_audit.log

Apache-Error: 
下载地址
 
 [level 3] client denied by server configuration: /var/www/myapp/public/api

That points directly to the error.
Now I need advice on how to configure mod_evasive to handle dropzone multiple upload.

>I think this is from Apache's mod_evasive module. This module protects against DDoS attacks by limiting the number of requests a single IP address can make quickly.

You can do two options in this

Option 1

Modify the mod_evasive configuration in your apache.

1. DOSPageCount: This is the number of requests for the same page.

2. DOSSiteCount: Requests for any object by the same client on the same listener per site interval.

   DOSPageCount 30
   DOSSiteCount 30
   

Option 2

Add parallelUploads option to the Dropzone

Dropzone.options.myDropzone = {
    parallelUploads: 5,  // According to your mod_evasive limit
}

I found the solution.
I configure mod_evasive like this

DOSPageCount 25

I increase DOSPageCount from 2 to 25 because I have max of 25 files for the upload.