The Media Player continues to have a delayed processing time. Our developers have identified why and are working out a solution as quickly as possible. For now, high volume hours, in any given day, remain 12pm-6pm. It is suggested to try and upload a file before 11am or sometime after 6pm. Once processing is completed, you can move forward with publishing.
*UPDATE: as of 1/15/2019 Media Player updates are officially in place with confirmation that processing is working again!