search engine

can i make search engine for my web to find my webs file in my web

I don’t quite understand, but if you want to browse file within your cluster (server) environment, then you should learn how to implement “Search”, it’s either using query (SQL) or Javascript.

Bear in mind that free hosting isn’t meant to be “file storage”.
If you really mean search engine is something like Google, then the answer is obviously no.

Sure, many applications come with search functions built in, we don’t have any restrictions on that. When writing it yourself, please just make sure that the database queries you use are efficient, otherwise you risk overloading the database.