Here you get the first mod with integrated bale storage. The building is a standard building from Farming Simulator 22 and was provided by [FD] TaranDwyn with the “ObjectStorage” script from GTX. You must also have this mod in the mod folder for the bale storage to work. Without the script, the building will work of course, but without the function.
How to install FS19 mods?
Firstly find a mod which you like and want to download. Then download a mod to your PC. Mods are usually in .zip format file. But sometimes it can be in .rar. If a mod file is a .zip format no needed additional actions. If a file is in .rar, then you must unarchive mod with software like WinRar or Zip7. Windows 10 users no need to use software for archives, Win10 itself has a feature to unarchive files.
The next step is to find mods folder in your PC. Usually, it is in Documents/My Games/Farming Simulator 19/2019. Open the "mods" folder and put downloaded .zip archive or unarchived .rar file to this folder.
Last step. Enjoy of FS19 mods!