Hello LinaS - The Update Response API can be used to update embedded data fields.
https://api.qualtrics.com/daed82306b1ea-update-response
One limitation is that there is not a bulk API for this. Updates are made based on the individual responseIds.

For anyone that has found this thread while looking to update/overwrite existing Embedded Data on a survey using the API.   The best solution that I have found will require a little bit of work, but involves the following steps:

1. Fetch the entire flow for your given survey using the `Get Flow` API call:
   • https://api.qualtrics.com/773d3d5865ca9-get-flow
2. Implement your own logic to detect and copy which flow element has the Embedded Data you are looking to update/overwrite
3. Make your intended edits your copy of that Embedded Data flow element 
4. Use the `Updates Flow Element Definition` API call to overwrite the existing Embedded Data flow with your edited copy
   • https://api.qualtrics.com/39f7b03f9e94e-updates-flow-element-definition

​@LinaS ​@CRQualtrics ​@cep_donovynp 

Great question! The native Qualtrics interface doesn't have great bulk update options, but you can use the APIs.

We built a free tool that makes this super easy for non-technical researchers: Qualtrics API Toolkit (Chrome extension). Zero coding required - just a simple upload-and-execute interface.

Just upload your CSV with responseId in column A and your update fields in other columns. It handles all the API calls, validation, and progress tracking for you.

No-code solution - designed specifically for non-technical researchers
Upload a CSV with responseId + your embedded data fields
Validates everything before processing
Tracks progress in real-time
Simple point-and-click interface

Give it a try and let me know how it works! Happy to share with anyone else who needs bulk response updates.

Free Chrome Extension:

https://chromewebstore.google.com/detail/lloepmlcmkeohopokcedejdelohoilip?utm_source=item-share-cb

Docs:

https://piraiai.com/docs/qualtrics-api-toolkit