Skip to main content

Everything you need to learn Optimizely X in one place: See our resource pages for Web Experimentation and Personalization.

Optimizely Knowledge Base

Troubleshooting: Access the datafile for Mobile and OTT projects

This article is about Optimizely X Mobile and OTT. If you're using Full Stack, check this article out instead.
relevant products:
  • Optimizely X Mobile
  • Optimizely X OTT

  • Access the datafile for a Mobile or OTT project
  • Debug and troubleshoot a Mobile or OTT experiment 

To maintain backwards compatiblity with older SDK versions, Optimizely maintains multiple versions of the datafile. Datafile versioning ensures that apps that haven't been upgraded to the latest version of the SDK are still able to run experiments. For each SDK project, Optimizley uploads the datafile once per datafile version.

For example, for project ID "123," if we have 3 versions of the datafile, we will upload the following three files to the CDN:

The Optimizely X Dashboard will always show the path to the latest datafile version. In this case,  The latest version is also accessible at

If you’re using Optimizely’s Mobile or OTT SDKs to manage synchronizing the datafile from Optimizely, you don’t need to interface with different datafile versions directly.  The SDK will make sure to use older versions of the datafile for older versions of the SDK.

Here's how to access the datafile:

  1. Navigate to the Settings dashboard and select the Datafile tab.

  2. Then, click View to see the content delivery network (CDN) link for the datafile.