file: ///sdcard/ To view and open files from storage on your device you should typically use a file manager, like many that exist in the Play Store. file ///sdcard, If your phone doesn’t have one or you don’t have access to it, you can also make use of the web browser. Simply enter the URL file:///sdcard/ in the address bar of Google Chrome, Firefox or Samsung Internet.
This isn’t really a trick. It’s just a type of URL, as old and standard as the “http://”, and that’s why several browsers understand it. The difference is that the “http”, used to recover resources on the Internet is replaced by the “file” scheme, which is used to retrieve a resource on the computer or on a local network, in addition to three slash “/” after the colon.
With this URL you will be able to see all the files and folders that are in the internal memory of your device, including hidden files (whose name starts with a period). You can also open or view most of those files in the same browser, be they photos, videos, documents or PDFs. You can even install APK files from there.