Is there any way to upload, insert files from any excel sheets(google sheets, MS,...) into salesforce records?
Salesforce has several useful APIs for getting data in to, and out of, Salesforce, available on a cornucopia of platforms. Simply use a search engine with something like "[some application] salesforce integration." For example, I found the Data Connector for Salesforce app that integrations Google Sheets with Salesforce by typing google sheets salesforce integration into Google. It's just a matter of finding the product/service/app that suits your needs and, if necessary, budget (not all apps will be free, of course).