The easiest method to share files between your devices is to use some cloud app.
If you have an Apple iCloud account on your iPad, then you can install that on your PC and that will store your files on iCloud that will be synced between the devices.
Or if you have OneDrive installed on your PC, you can install that on your iPad and use that to sync the files between the two devices.
The main thing top remember when using a cloud service is to ensure you do not exceed your online cloud storage allocation to avoid loosing files.