File uploads are where good forms often fall apart. Someone waits for the spinner to stop—then gets hit with "file too large" or "wrong format". It's a small frustration that can cost a submission.
You can fix it before it happens. Add a short note beside your upload field explaining what works: "PDF, JPG, or PNG. Max size 10 MB". If you support multiple files, say so.
It's a tiny detail, but it builds trust. People finish forms when they know what's expected.
👉 Read more about file uploads