> For the complete documentation index, see [llms.txt](https://docs.echo3d.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.echo3d.com/ar.js/troubleshooting.md). # Troubleshooting ## Known Issues Our team is actively investigating the following issues: * **Video assets** in AR.js with **NFT-support image tracking** fails to show on iPad while audio plays. Using an iPhone or using market-based image tracking should work. ## I can't see the 3D asset! ### Are you pointing to the right target? Make sure to point your phone to the QR code or, if you set an image target, to the image you uploaded. ### Is your asset too small/big? It might be the case that your 3D asset is too small or too big to appear in the camera view. Scale the model by pinching the screen with two fingers. If that does not work, change the size of the model by adding a metadata key named `scale` to the 3D models. See how to add metadata in the [Data Page](/web-console/manage-pages/data-page/how-to-add-data.md#1-adding-a-data-entry-1) section of the documentation. Now **rescan the QR code** to rebuild and refresh your AR.js app. ## I am getting some other error. Let's talk! Ask on [Slack](https://go.echo3D.co/join) or send an email to and please attach a screenshot of the error you are experiencing. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.echo3d.com/ar.js/troubleshooting.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.