I had timeout problems trying to upload large video files and none setting in php.ini and/or .user.ini solved it. The only way to solve the issue is by disabling reqtimeout_module at Apache conf file. Then everything worked fine, which means that my PHP settings are correct for large files.

But as I don't want to deal with Apache settings (Server or vHost), I'm trying with .htaccess file. The code below seems to be ok, I found it as solution to similar issues here. The problem is that it gives my 500 Internal Server Error when I'm adding it to .htaccess file.

What I'm doing wrong?

<IfModule reqtimeout_module>
RequestReadTimeout header=0
RequestReadTimeout body=0
</IfModule>