Secure upload files in Laravel

I have a Laravel 5 project in which I am uploading files in database in Medium Blob format.

But uploading files in database takes some extra time to execute.

Uploading files in database is a secured way to keep files safe from crawlers or some bots.

I have tried to Upload files to the Public folder. But the crawlers can open these files.

Is there any possible way to upload files in the file system?

So that the Crawlers cannot open these files.

I want these files to be Secured

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