After opening https://console.redhat.com/insights/content/repositories#SIDs=&tags= , 

• Ciick on Add Repositories
• Give it a name and Select "Upload" as the Repository Type
• Arch = x86_64 and OS version el9 
• Save the repo
• When prompts , upload any el9 based rpm file in the repo
• Once the package is uploaded, Wait for the repository snapshotting to finish . The status should show as Valid. 

Now, At step 2 when we select the type as Upload, It has a text there which says 

Create a repository to upload custom content to. Snapshots will be taken after every new upload, allowing you to build images with uploaded content.

But now if i access https://console.redhat.com/insights/image-builder , try to create a new el9 blueprint, I would not be able to see this newly created "Upload" type repo in the Custom Repositories option and hence cannot continue with the Blueprint creation. 

This seems like a bug that needs fixing.