How can I submitted best proposal in Upwork?

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Hello Everyone,

If you are a helper, You can help me now. As I am a new upwork freelancer and create a new profile Yesterday. But I don't know, What type of proposal the client can like. I mean a short proposal or long or as short as brief as possible. If I added some work files that I have done it previously, Is it good or not?

Cheers,

Mehedi