Allowing app installs from Unknown Sources in AndroidNavigate to Setting > Security.Check the option Unknown sources.Tap OK on the prompt message.Select Trust.
Source : https://www.applivery.com/docs/mobile-app-distribution/android-unknown-sources/
If you need to know how to open PDF files on Android, follow these steps:Download and install Acrobat Reader from the Google Play Store. Launch the app.On the bottom menu bar, choose Files.Locate your PDF file on your Android and select it.Read your document.
Source : https://www.adobe.com/acrobat/hub/how-to-read-pdfs-on-android.html
If a file won't open, a few things could be wrong: The file owner didn't give you permission to open the file. You're signed in to a different Google Account. Someone removed your permission to access the file.
Source : https://support.google.com/docs/answer/6211862?hl=en&co=GENIE.Platform%3DDesktop
Search File Explorer: Open File Explorer from the taskbar or right-click on the Start menu, choose File Explorer and then select a location from the left pane to search or browse.
Source : https://support.microsoft.com/en-us/windows/find-your-documents-in-windows-5c7c8cfe-c289-fae4-f5f8-6b3fdba418d2
View your filesOn your Android device, open Files by Google .Tap a category. You'll see files from that category in a list.To change how the files display, tap Grid view . To go back to a list, tap List view .Optional: To sort your files, on the top right, tap More . Select Sort by.
Source : https://support.google.com/files/answer/9765314?hl=en
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Source : https://www.youtube.com/watch?v=L_ur42tHLI0