[wp-trac] [WordPress Trac] #63561: The media upload button is not disabled when no image has been uploaded

[WordPress Trac]

#63561: The media upload button is not disabled when no image has been uploaded
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 Reporter:  karinchristen            |       Owner:  joedolson
     Type:  enhancement              |      Status:  accepted
 Priority:  normal                   |   Milestone:  6.9
Component:  Media                    |     Version:
 Severity:  normal                   |  Resolution:
 Keywords:  has-patch needs-testing  |     Focuses:  ui, administration
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Comment (by rollybueno):

 == Reproduction Report
 === Description
 This report validates whether the issue described in the ticket can be
 reproduced.

 Specifically, when using the browser uploader in the Media Library (via
 **Media** → **Add New** → **browser uploader**), the **Upload** button
 remains active even if no file has been selected.


 === Environment
 - WordPress: 6.9-alpha-60093-src
 - PHP: 8.2.28
 - Server: nginx/1.27.5
 - Database: mysqli (Server: 8.4.5 / Client: mysqlnd 8.2.28)
 - Browser: Chrome 137.0.0.0
 - OS: Linux
 - Theme: Twenty Twenty-Five 1.2
 - MU Plugins: None activated
 - Plugins:
   * Query Monitor 3.18.0
   * Test Reports 1.2.0
   * Transients Manager 2.0.7

 === Actual Results
 1. ✅ Error condition occurs (reproduced).
    - Navigated to `Media → Add New`.
    - Switched to **browser uploader**.
    - Clicked the **Upload** button without selecting a file.
    - Result: Redirected to a `wp_die()` error page due to missing upload
 file.

 === Additional Notes
 - The **Upload** button is not disabled when no file is selected.
 - Clicking it without selecting a file results in a server-side error
 instead of being blocked on the client side.
 - This could be confusing for users expecting a disabled button until a
 file is chosen.

 === Supplemental Artifacts
 **Classic browser uploader for single file**. You can see in this
 screenshot on where you can find it.
 [[Image(https://i.imgur.com/twboR58.png)]]

 **The single file upload page**. You can see that the button is not
 disable by default, or when the file filed is empty.
 [[Image(https://i.imgur.com/cQ75Y5y.png)]]

 **If you clicked that without file uploaded**, you get this old classic
 wp_die().
 [[Image(https://i.imgur.com/RUBzvn9.png)]]

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Ticket URL: <https://core.trac.wordpress.org/ticket/63561#comment:7>
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