fix(submit-score): remove multiple file upload attribute, add accept attribute

[ThorsAngerVaNeT]

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🤔 This is a ...

• New feature
• Bug fix
• Performance optimization
• Refactoring
• Test Case
• Documentation update
• Other

🔗 Related issue link

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💡 Background and solution

Remove Multiple attribute, add access attribute. add type for param in onChange handler.

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