This is a recording of the Webinar on April 23, 2020 during the COVID-19 Quarantine. It begins with a video about Supported Self Paced training and then we briefly discuss our Work from Home Options. Then we cover the details of the webinar which is how to define a large assembly, what goes on under the hood (behind the scenes) when opening a file, where are we opening the file from, what hardware should we have, what are the different ways to open/access a large assembly file, mate best practices, mate errors, rebuild, image quality and influence of detail. Chapters 3:00 Welcome 5:00 Design From Home Resources 7:15 Agenda 8:00 What is a Large Assembly 9:00 Opening Assemblies: Under the Hood 16:20 File Open Options: 17:15 1. Lightweight 18:44 2. Large Assembly Mode 19:40 3. Large Design Review 22:15 4. SpeedPak 24:05 Assembly Tools 27:30 Mates and Rebuilding 32:30 3rd Party Data 35:00 Image Quality and Part File Recommendations