Hello.I sent a request about your situation to the company technical support.Please expect an answer from them here in the comments.

Hello P.

The software poses no such limit to the search function. The code is built to be able to search the project no matter the size of it. Of course, the more data you have on your website, the longer it might take to search inside it.

For the moment, we're not aware of such a limit and if it exists, it is probably something set up by your hosting over which the software has no control. 

What error exactly are you getting? Please report that to me here so that I might analyze the situation more in-depth

Thank you

Stefano

Hello, there is an HTTP 500 error
I contacted the hosting support, I was assured that everything works as expected from their side and there are no restrictions on the volume of files processed.
maybe this is PHP timeout.?
when a 29.9 megabyte file everything works,
30.1 megabytes gives an HTTP 500 error

Hello P.

That could definitely be. 

Error 500 is a generic error that is presented when an error occurs on the server. Your hosting's support should be able to check the ERROR LOG for your website and tell you exactly what the error is. If it is a timeout error it should be reported there, but they are the only ones that can access this information

Please contact them again and have them provide this information to you so that I might help you out better with this

Thank you

Stefano