Uploading documents with file picker. Can these be accessed by Google Search?

Hi, I have included a file picker in my app for uploading pdf documents and images that other App users can access. I noticed the link produced was storage.googleapis.com. While the documents are of a sensitive nature, and anybody with the link can access them, I feel relatively safe in assuming no one can guess the link (?).

However my question is , can the documents or their contents be searched by Google or other search engines? In other words, can the link be provided to other people through search engines?

Many thanks in advance

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Google cannot discover unless you link to them from some other website Google can crawl.