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Again, I have attached the pictures of the damaged item as you requested.

I have again attached the pictures of the damaged item as you requested.

The pictures of the damaged item are attached again as you requested

Comments  

I don't know what what exactly the question is but I can tell you out of those 3 the first one sounds the best. This can be incorrect thought depending on what you want to express. There has to be more content to this for further elaboration.

Here an adverb 'again 'is used at different places which exhibits the emphasis and meaning differently.

Again, I have attached the pictures of the damaged item as you requested.

(This sentence gives the meaning as " Previously, I sent it and as per your request i send it 'again. The emphasis is on 'again '.

I have again attached the pictures of the damaged item as you requested.

(Here, it means 'the attachment 'was done again though this was sent previously, emphasis is on "attached'.

The pictures of the damaged item are attached again as you requested.

Here, the emphasis is on 'the pictures of the damaged item',

The meaning of it is 'I sent the pictures of the damaged item once again and the same pictures have been sent not any other pictures of other item.