其余不用强求直译。你可以在文中说：Enclosed please find the invitation.
或者：：Enclosed please find the invitation（标上附件的文件名）.
谁会管这是不是扫描件呢？
scanned document
The attachment is a scanned document (或image也可) of the invitation
scanned copy of invitation letter
The attached document is the scanned image of invitation
the scanned copy
is OK!
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