Confirm there are not already settings or features that do what the shop is asking for- Currently, CS does not support automatically broadcasting pre-recorded live sales to Facebook simultaneously. The only available workaround is for the shop owner to manually download the video from Live History and upload it directly to Facebook.
What does the shop want the product to do- The shop wants pre-recorded live sales to post directly and automatically to Facebook at the scheduled time, in addition to broadcasting on the app, without requiring manual downloading and uploading.
Why/how would it improve sales or efficiency- Many of the shop's customers rely on Facebook notifications to know when a live stream is happening before switching over to shop on the app. Automatically posting pre-recorded lives to Facebook would restore expected audience engagement and viewer traffic, resulting in higher sales without adding extra manual steps for the seller.