How can I create a custom plugin for a dropdown in Strapi Admin Panel?
I want to implement the following functionality in the Strapi Admin Panel:

1. The dropdown has 3 values, but by default, no value is selected, so no additional field will be shown – only the dropdown will be visible initially.

2. Once the user selects a value from the dropdown, if the selected value is 'media' (for example), then:
- The dropdown will show 'Media' as selected.
- A media field will appear below the dropdown.

This should be implemented entirely within the Strapi Admin Panel.
So how can I do this?

And also I created custom plugin for that but is shows this,

![Image](https://github.com/user-attachments/assets/54022f43-ac94-45b5-8817-4d74a9e233c4)