> For the complete documentation index, see [llms.txt](https://help.qonic.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.qonic.com/other/faq.md). # FAQ Frequently Asked Questions and their answers.
What are the supported file formats? Currently supported file types are .ifc, .3dm (Rhino3D), .skp (SketchUp) and .rvt (Autodesk Revit versions 2024 - 2027). Revit models can also be imported through the [Qonic plugin for Revit](https://www.qonic.com/downloads). Note that if a Revit upload through the dashboard fails, it is recommended to try again using the plugin. The file size limitations are as follows: * .ifc import: 5GB file size limit, process timeout of 1 hour. * .3dm import: 5GB file size limit, process timeout of 1 hour. * .skp import: 5GB file size limit, process timeout of 1 hour. * .rvt import through the **dashboard**: 256MB file size limit, process timeout of 30 mins. * .rvt import through the [Qonic plugin for Revit](https://www.qonic.com/downloads/): no file size limit, although once converted to Qonic the resulting data of the model cannot exceed 4GB. A Revit model imported through the Qonic plugin for Revit can be edited, and the changes can be pushed back to the original Revit model through the same plugin.
How do I change the units of my project? Project owners can choose between the metric and imperial unit system, and set the units for length, area and volume, in the Project Details page of the project settings. These units are used throughout Qonic, for example by the Measure and Quantify tools and in the Report Panel. Read the article on [Project Units](/documentation/qonic-dashboard/projects.md#project-units) for more information.
How do I change the language of Qonic? Qonic is currently available in English and German (Deutsch). To change your language, click your profile in the dashboard, open *Profile settings* and choose a *Language*. The dashboard switches to the new language, and the Qonic application uses it the next time you open a model. All interface elements and commands are translated. The data in your models, and built-in libraries such as IFC properties and quantities, are not translated and are shown as they are.
Qonic crashes in the web browser. What's going on? Dealing with complex geometry demands significant memory resources. Web browsers have limitations on memory usage. Hence, we strongly advise utilizing the Qonic desktop application for a smoother experience. When approaching the memory limit of your browser, you will be notified in the following order: 1. **First stage:** Your model is approaching the memory limit of the web browser. We suggest to continue your work using the Qonic app. 2. **Second stage:** Your model has almost reached the memory limit of the web browser. We have activated read-only mode. Please continue your work using the Qonic app. 3. **Third stage:** Your model has reached the memory limit of the web browser. Please restart Qonic.
What are Qonic's hardware recommendations? Since Qonic can run in a web browser, you don't need a very powerful workstation to use it. Sufficient RAM and a dedicated GPU are recommended, but any modern laptop or desktop pc should suffice. To enhance performance, ensure your graphics drivers are updated and enable WebGL and hardware acceleration in your chosen browser. Additionally, Qonic offers desktop applications for both MacOS and Windows. Qonic currently supports these browsers: * Google Chrome * Microsoft Edge * Firefox To optimize your Qonic experience for peak performance, please follow these steps: 1. Make sure your graphics drivers are up-to-date with the latest version from the manufacturer. 2. Confirm that your preferred web browser not only has **WebGL enabled** but also has **hardware acceleration** turned on. This will help ensure you're using the highest performing configuration possible. If you encounter performance issues with Qonic in the web browser, consider using the desktop app instead. The Qonic app is available as desktop application for MacOS and Windows, and can be downloaded at [qonic.com/downloads](https://www.qonic.com/downloads).
My model shows a red warning triangle and I cannot open it. What do I do? This means the model failed to process. This can happen because of many reasons; maybe the file is too large, or it contains some geometry or other data that causes a failure. Our system should pick this up so that our development team is automatically notified of any failures. If you want to be sure, you can always file a support ticket.
Why can't I edit some models? The top-left corner indicates if a model is opened in read only mode, or if multiple models are opened. **Read Only** - this means either: * You only have viewing rights to the model. Contact the model owner or project administrator to ask for editing rights. * You have opened an older version of the model. Read the article on [Model Version Management](/documentation/qonic-dashboard/models/model-version-management.md) for more information about model versions. * You are approaching the memory limit of your web browser. To prevent a crash your session was automatically set to read-only. This will be indicated in a banner at the top of your screen. **Multimodel:** if you have multiple models open at once, only one of the models will be editable. Click the [model picker](/documentation/qonic-application/basics/model-picker.md) in the top-left corner to change the active model.
When opening my model, I get the message “Processing model changes, please reload in a few minutes”. What does this mean? This means you or someone else has just published their changes in this model to the server. Depending on the size of the model, this may take a few seconds to several minutes to fully process. If this message persists for longer than half an hour, this may indicate that your personal version of the model got damaged. Try [reverting](/documentation/qonic-dashboard/models/model-version-management.md#accessing-the-version-history-of-a-model) back to a previous version of the model.
Why can I no longer open my model? This may indicate that your personal version of the model got damaged. Try [Reverting](/documentation/qonic-dashboard/models/model-version-management.md#accessing-the-version-history-of-a-model) back to a previous version of the model.