<!--
{
  "availability" : [
    "macOS: 10.13.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "PhotoKit",
  "identifier" : "/documentation/Photos/PHProject/projectExtensionData",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "Photos"
    ],
    "preciseIdentifier" : "c:objc(cs)PHProject(py)projectExtensionData"
  },
  "title" : "projectExtensionData"
}
-->

# projectExtensionData

Data associated with the project extension.

```
var projectExtensionData: Data { get }
```

## Discussion

The total size of stored data is limited to 5 MB; attempting to store more data will result in an error. Don’t include rasterized images that can be locally cached. Limit stored data to compressed project-specific data.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)