I tested your project on Mac OS 10.13.4 using the latest version of Adobe XD, and I am unable to reproduce your issue. In another post, a user wondered about whether this is an issue with the latest version of Mac OS, although I am not sure if that is the reason.
Which OS are you on, and what is its version number? Also provide the version of XD that you are working with.
certainly my environment is the latest MacOS.
Thank you. Let me check and get back to you.
The team is investigating this issue. Meanwhile, if possible, can you try exporting on a different version of Mac OS and let us know if it worked?
Are you viewing the PDF in Preview or in Acrobat reader? The team tested the scenario, and they were able to reproduce it in Preview but not in Acrobat reader. Just to be sure, 10.10 is not a supported OS for Adobe XD version yet, although it is unlikely to be causing this issue.
As per the other post, this problem is only when viewing the exported PDF on Mojave. Clearly there is something about the PDF that is not 100% right but this and the way Mojave is rendering the PDF is the cause. Workaround is to open the exported PDF in Acrobat and then Export as Other > Optimised PDF. Then all is good on Mojave. Hopefully an upcoming XD release will provide the fix for Mojave.
> As per the other post, this problem is only when viewing the exported PDF on Mojave.
It was a blind spot for me. You're right!
I uploaded PDF to Dropbox and previewed through Dropbox viewer, the placed image was displayed correctly without flipping.
> Are you viewing the PDF in Preview or in Acrobat reader?
Thanks, in Preview. I was not viewing in Acrobat reader.
> Meanwhile, if possible, can you try exporting on a different version of Mac OS and let us know if it worked?
Sorry, my another mac is also latest Mojave&XD...
I tried and the same problem was seen.
The team confirmed that this is an issue when using with Preview, they are updating the help documents with that information.
I suggest viewing your files in Acrobat Reader after export.
I uploaded PDF to Google Drive and from my iPhone previewed through Google Drive viewer, the placed image was displayed INCORRECTLY.