On April 21, 2022, in Cargo Systems Messaging Service (CSMS) #51674652, U.S. Customs and Border Protection (CBP) announced new videos on effectively using the legacy Automated Commercial Environment (ACE) Portal and ACE Reports functionalities. There are separate trainings for brokers, carriers, exporters, and importers.
CSMS #51674652 can be found here:
https://content.govdelivery.com/bulletins/gd/USDHSCBP-3147e1c?wgt_ref=USDHSCBP_WIDGET_2
The ACE training webpage and reference guides can be found here: