MediaUploadModal: allowedTypes='*' wildcard not handled in upload path, causing all uploads to fail

[dinhtungdu]

Description

MediaUploadModal supports '*' as a wildcard in allowedTypes but passes it as-is to uploadMedia(). Inside, validateMimeType has no handling for '*' — it checks file.type.startsWith('*/') which is never true, so every upload fails with "Sorry, this file type is not supported here." instead of being allowed through.

Step-by-step reproduction instructions

1. Enable the Data Views: new media modal experiment under Gutenberg → Experiments
2. Install the test plugin: https://github.com/dinhtungdu/verify-wildcard-upload
3. Add the Wildcard Upload Test block to any post
4. Open the Inspector → "Wildcard Upload (allowedTypes=[*])" panel
5. Click "Select / Upload any files" and upload any file type (PNG, PDF, .xyz, etc.)
6. Observe the error: "filename: Sorry, this file type is not supported here."

Screenshots, screen recording, code snippet

Environment info

• Gutenberg trunk
• Affects both @wordpress/media-utils and @wordpress/upload-media packages