Steam Deck has introduced an amazing application called Discover software Center. It is an application similar to the IOS Store or the Android Play Store.
It uses third-party applications that can help in many ways. The Discover Software Center has allowed players to use files that can transfer files from your PC to your Steam Deck.
How to Send Files from Your PC – Steam Deck

Starting off, you want to open up your Discover Software center and in the search bar, look for a program called “Warpinator”. This program allows both platforms to send and receive files across the network.

To begin sending files, simply open up the application and select the Send files option. Your PC will be automatically linked from the Steam account and can send and receive files.