When using Royal Mail with Shiptheory, you may also be booking and sending orders to Royal Mail on a Saturday. However, you may notice that upon going to manifest on a Saturday; your orders won't actually display as available for manifesting. They'll instead show up on Monday's manifest.

The solution here is to ensure that Saturday Collection is enabled in your Royal Mail settings in Shiptheory. To enable this, head into your Royal Mail settings page and enable the following option:

Once set to "Yes", don't forget to hit save.

If you still have this issue with Saturday Collection enabled, please feel free to Contact Support.