Add vector search to search resource option greyed out

In Azure AI Foundry Project's Chat Playground, I'm trying to add a data source of Search Service, but this option is greyed out.

Articles only mention that the Azure OpenAI service should have the text-embedding-ada-002 model, but while creating the service there is no such option now. I have these models deployed in the project.

Here is how I have created the search index:

1. In the search service, chose Import data (new).

2. Selected Azure Blob Storage as the data source.

3. Select RAG as the targeted scenario.

4. Selected the storage container which has the PDF documents.

5. These are the settings in the Vectorize your text step.

6. Did not select any checkbox in the Vectorize and enrich your images as the files are only PDFs with text.
7. In the Advanced settings step, checked Enable semantic ranker.

This is how the created index looks:

What am I doing wrong? Do I really need the Add vector search to search resource option.

I guess I found your issue.
Can you go to your index and check if you have added a the text embedding model there as well?
Make sure you add the adda-002 model as others wont work in the playground/free tier, after you added the model, it takes like 5 minutes and then it should not be grayed out anymore
Here I show where you have to add it: enter image description here