Currently, Nira only supports mesh assets, not point clouds. Uploading a point cloud file (e.g. PLY, OBJ, FBX, or any other file format containing only points and no mesh data) will fail to render. Point cloud support is definitely on our roadmap, and we'll be sure to announce it once it's ready.
You can find out if an OBJ file is a point cloud file by opening the OBJ file in a text editor and searching for "f " (the f character followed by a space, without quotes). If you don't find a line starting with "f ", this means the OBJ file is a point cloud.
Note: We will update this article once this feature is supported, so feel free to create an account here on the help center, and once you're logged in you'll be able to click the Follow button above to be notified when it's ready.