Currently, creators can upload gifs to their marketplace listings (Limit 1 I think?). GIFs are heavy, even if they are low quality and low frame rate. That's three cons: Low frame rate, low quality, and heavy bandwidth wise. Many sites, including Tenor, Giphy, Reddit, and Discord, convert to gifs to webm when possible. However, they also allow uploading of webms now. The benefit is the low size of webms while retaining relatively good quality and frame rate. This will allow creators to better demonstrate their objects, especially animated objects, animations, or otherwise show case special features of a product with extended play time, quality, and resolution, while still maintaining a less than 1 megabyte upload limit. The server can use ffmpeg to sanitize webm uploads (I.E. remove audio, constrain resolution, etc), as many other sites do. The upload limit could be addressed separately. Alternatively, allowing linking of youtube, vimeo, sketchfab, etc as a preview. This offloads the need to host the video, though this means the video can disappear at any time. I feel that this is important, as gifs are a underutilized feature on the marketplace, which I feel is in part due to the low quality of them, and the fact it doesn't do the product it is advertising justice.