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From the image it would appear you are using AutoCAD 360 Mobile. I moved your post to the appropriate Forum.
-mike
Hi @Anonymous,
Are having trouble with exporting your drawing as PDF?
Have you tried exporting the file from AutoCAD 360 web app (https://client.autocad360.com/), or Win 10 app as well?
If you'd like, please contact us at feedback@autocad360.com, with your username and file's name, so we could examine this issue farther.
Thanks,