Hi,
I have confirmed that if I attach the sample GIF into a page in my test instance, it is visible as expected in the PDF export. I will close this bug report until we can obtain steps to reproduce from the affected users.
Kiran and Leeann, I recommend that you go to http://support.atlassian.com and create a new, private support ticket. Please attach:
1) A zip of your Confluence logs
2) Wiki markup for the pages
3) PDF
4) Screenshots of the page view
Please reference this bug report as well.
Cheers,
David Soul
In our case, I generated the images from the source using snagit instead of from word document and that solved it.