How did you send the file from Windows 10 to the iPad?
Typically with VLC, you would enable WiFi Sharing
Use the browser on your Windows 10 machine to go to the URL displayed in WiFi Enabled section of the app.
Then with the Windows 10 browser use the Upload Files button to select and send the files.
Back on the iPad, the VLC app will show you the files uploaded to your library and let them be played.