Cannot submit app due to icon and cover image upload failure

I’m trying to submit an app, but I’m prompted to upload an app icon and a cover image.
The issue is that I cannot upload a file. When I uploads a file, it keeps giving the same error “Upload failed, please try again later”
In the console logs, it shows this error:
[Error] Failed to load resource: the server responded with a status of 400 () (upload, line 0).
I have tried to upload both .png and .jpg files and it gives the same error.
I have not had any issues uploading files in other places earlier, such as for the Technical Architecture Diagram and other documents.

How To Reproduce

  1. Navigate to “App Listing”, then switch to the “App Information” tab in app submission.
  2. Click to upload either an icon or the cover image.
  3. Select a file to upload.
  4. It should show the error “Upload failed, please try again later” in the UI and shows the error in the console logs as [Error] Failed to load resource: the server responded with a status of 400 () (upload, line 0).