> 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/api/data/what-metadata-is-stored.md). # What Metadata is Stored Aside from [metadata you add](/web-console/manage-pages/data-page/how-to-add-data.md#adding-metadata) to each individual content entry, you are also able to query for metadata automatically generated by the platform for each individual content entry. Different asset types and target types can determine the automatically generated metadata available. ### Any Content Entry These metadata keys are available for any content entry regardless of the asset type or target type. | Key | Type | Description | Value Example | | --------------------------- | ------ | --------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------- | | createdAt | Number | Timestamp in UTC format of the time the content was created | 1587258208433 | | lastAccessed | Number | Timestamp in UTC format of the last time the content was accessed | 1587248667634 | | accessHistory | Array | A collection of timestamps in UTC format of the times the content was accessed | \[\\"1587253222904\\"] | | usageByDate | Object | A collection of dates in human readable format in which the content was used and a counter of the overall time it was used. | \[{\\"date\\":\\"2020-04-18\\",\\"numUses\\":12.0}] | | qrWebXRStorageFilename | String | Filename of a QR image redirecting to a sample WebXR experience that shows this asset | qr\_webxr\_my\_key\_1234.png | | qrWebXRStorageID | String | Storage ID of a QR image redirecting to a sample WebXR experience that uses this asset | 9d39d3f4-68f5-49ae-a798-903ac249f073 | | qrARjsStorageFilename | String | Filename of a QR image redirecting to a sample AR.js experience that shows this asset | qr\_arjs\_my\_key\_1234.png | | qrARjsStorageID | String | Storage ID of a QR image redirecting to a sample AR.js experience that shows this asset | fd3f4c85-5d47-40ea-a38c-9aeb728f780b | | qrARjsTargetStorageFilename | String | Filename of the target file used for a sample AR.js experience that shows this asset | qr\_arjs\_my\_key\_1234.patt | | qrARjsTargetStorageID | String | Storage ID of the target file used for a sample AR.js experience that shows this asset | ce090285-8b88-4b12-b9d3-da6490298da2 | | qrARjsMarkerStorageFilename | String | Filename of the image marker file used for a sample AR.js experience that shows this asset | marker\_qr\_arjs\_my\_key\_1234.png | | qrARjsMarkerStorageID | String | Storage ID of a QR image redirecting to a sample AR.js experience that uses this asset and doubles as a marker | bb9e8709-a882-49fe-a3d1-9804fa452ba4 | | source | String | Credit attribution to the creator of the asset | Skyscraper by Poly by Google, CC-BY | ### Specific Asset Types These metadata keys are available for content entries with specific asset types. #### Model Assets | Key | Type | Description | Value Example | | ------------------------------ | ------ | ---------------------------------------------------------------- | ----------------------------------------- | | glbHologramStorageFilename | String | Filename of a .glb version of the 3D model, if such exists | Skyscraper.glb | | glbHologramStorageID | String | Storage ID of a .glb version of the 3D model, if such exists. | d686a655-e800-430d-bfd2-e38cdfb0c9e9.glb | | usdzHologramStorageFilename | String | Filename of a .usdz version of the 3D model, if such exists | Skyscraper.usdz | | usdzHologramStorageID | String | Storage ID of a .usdz version of the 3D model, if such exists. | d686a655-e800-430d-bfd2-e38cdfb0c9e9.usdz | | vuforiaHologramStorageFilename | String | Filename of a .h version of the 3D model, if such exists | Skyscraper.h | | vuforiaHologramStorageID | String | Storage ID of a .h version of the 3D model, if such exists. | 7068cd74-6c9f-4106-9326-585c56fa4475 | | shortURL | String | A short shareable URL which automatically redirects to the model | | #### Video Assets | Key | Type | Description | Value Example | | ------ | ------ | ------------------------- | ------------- | | height | Number | Height of the video frame | 360 | | width | Number | Width of the video frame | 460 | #### Image Assets | Key | Type | Description | Value Example | | ------------------------ | ------ | --------------------------------------------------------------------------------------- | ------------------------------------ | | height | Number | Height of the video frame | 360 | | width | Number | Width of the video frame | 460 | | compressedImageStorageID | String | Storage ID of the compressed version of the image uploaded by the user, if such exists. | d2c42d32-dd13-4541-b446-89dcf8e4bcb4 | ### Specific Target Types These metadata keys are available for content entries with specific target types. #### Surface Targets No additional metadata for surface targets. #### Location Targets No additional metadata for location targets. #### Image Targets | Key | Type | Description | Value Example | | --------------------------- | ------ | ---------------------------------------------------------------------------------------------- | ------------------------------------ | | originalImageStorageID | String | Storage ID of the original image uploaded by the user before being compressed, if such exists. | d2c42d32-dd13-4541-b446-89dcf8e4bcb4 | | arjsTargetStorageFilename | String | Filename of the target file used for a sample AR.js experience that shows this asset | air.patt | | arjsTargetStorageID | String | Storage name of the target file used for a sample AR.js experience that shows this asset | f6607f7b-aee2-4cc8-87e1-97be5a6c36a6 | | arcoreTargetStorageFilename | String | Filename of the target file used for a sample AR.js experience that shows this asset | air.imgdb | | arcoreTargetStorageID | String | Storage ID of the target file used for a sample AR.js experience that shows this asset | 420c746a-34e3-4535-b9ba-a4c14b4cc881 | | arjsMarkerStorageFilename | String | Filename of the image marker file used for a sample AR.js experience that shows this asset | marker\_air.png | | arjsMarkerStorageID | String | Storage ID of the image marker file used for a sample AR.js experience that shows this asset | 440c117a-5b11-4380-8d1d-6d54d3889c08 | | vuforiaTargetID | String | Target ID of the image used by Vuforia Cloud Recognition | 6309204a74d842a8b 6917e6aef743088 |