On your inventory page click "Price & Stock without title & description" CSV.
This will download the update file.
Go back to the file exchange. Click "Choose File" and upload the "Update" file which you have just downloaded from Lystr.
Be careful not to accidentally upload the create file again.
Your items will now be updated with the latest price and stock data. We recommend doing this at least twice a day, but the more you can do the more up to date your listings will be.