As requested, you is slightly redundant or per your request
It would be better to say "Please find the attached document as requested". The "you" isn't really necessary.
While both phrases are commonly used, neither is correct. "I have attached the document" is more direct. Here's another way you can phrase it: "Jane and I have revised the document (attached)."
When you say "please find the attached file" no need to mention "below" because the recipient will not find the attached document below or within the body of the email.
It would be more appropriate to say "Please find attached the document translated by you for stamping."
Yes, that is correct. It is a common and polite way to ask someone to look at the attached document.
When you say "please find the attached file" no need to mention "below" because the recipient will not find the attached document below or within the body of the email.
It is grammatically correct. However I prefer to say: "kindly refer to the attachment"
Yes, it is correct to say "Please find the attached copy of the proposal." This phrase is commonly used in business correspondence to indicate that a document is included with the message.
Both "please find attached for your use" and "please find attached for your usage" are correct, but "please find attached for your use" is more commonly used and considered more concise.
It all depends on the context surrounding it, but in and of itself "please see attached letter" is correct.
When you say "please find the attached file" no need to mention "below" because the recipient will not find the attached document below or within the body of the email.
It is often used: Please find enclosed several documents, as per requested. (Though per can be omitted - letters enclosed as requested, etc.)