First go to Steamworks to download the required SDK, modify the sdk\tools\contentbuilder\scripts inside the two VDF file name
APP_BUILD_1000.VDF file is your game software, DEPOT_BUILD_1001.VDF is your game software inside a depot, (an app can have multiple depot), app_build_1000. VDF in the file name 1000 modify your AppID in the steam background, such as your AppID is 819800, you change to APP_BUILD_819800.VDF. Change the DEPOT_BUILD_1001.VDF in 1001 to your steam background depot ID, if your depot ID is 819801, you will change to depot_build_819801.
II Modify the contents of APP_BUILD_XX.VDF and DEPOT_BUILD_XX.VDF
APP_BUILD_XX.VDF only change your appid and depots options.
DEPOT_BUILD_XX.VDF file to modify the Depotid and Contentroot,localpat three options
Three above the SDK configuration, the following can be packaged, open the Sdk\tools\contentbuilder folder, there are builder,builder_linux,builder_os three folders, respectively, corresponding to Windows, Packaged in three environments for Mac and Linux. This is a description of the packaging under Windows, so we find the Steamcmd.exe file under the Builder folder, double-click Open, and use steam command-line operation.
After opening you need to login to Steamworks's account, if you have a login key, you also need to enter your login key
Then enter Run_build_app your DEPOT_BUILD_1001.VDF file path
You have done all the work here. You can go to your steamworks and you can see your bag.
Build the unity package to the back of steam