NASS 2021 is using Learning Toolbox for the ePosters (including Poster Ground Rounds) and Innovative Technology Presentations at the conference.
Learning Toolbox allows you to create a Stack of material that can be used to present and share your work online and onsite. At the simplest level you can just add your presentation to your Stack, but the platform allows you to do much more.
Your Learning Toolbox Stack/ePoster should contain your presentation but can also contain additional materials such as videos, weblinks, papers and more.
Since you will upload your presentation to your Learning Toolbox Stack/ePoster then you will no longer need to upload your presentation to the NASS system.