The image is lost when copy-pasting it to another mockup.

Sorry, I forgot to tell important details:
1. Image should be taken from the local filesystem, not flickr or search.
2. Mockups should be in different folders.

As far as i understand, when I copypaste image, a relative path is copied and image could not be found. I think the best way to solve this is to embed the image into the mockup (base64-encoded or something like this).

I am unable to copy a portion of the mock-up ie; one box out of 10 on a page and transfer it to another page so that I can further explain to our engineers what needs to next happen

I get this problem when I copy and paste to a new mockup, untilI save the mock-up in the same directory to pick up the relative path.

it would be nice if the images were not lost due to relative path problems.