Solution
To solve the problem, simply regenerate the PDF with a different software. The simplest way is to print to PDF. Here's how:

Open the PDF file in any PDF reader or internet browser.
Open the Print window.
Change your printer. Select "Microsoft Print to PDF".

A file manager window will open for you to set the new PDF file's location and name. After you're done, click Save.
Go back to Kotobee Author and import the new PDF file.
An alternative solution would be to save the PDF file as PDF/A through Adobe Acrobat Pro.

Open the file in Acrobat Pro and select "PDF Standards" from the Tools section.

2. From the newly appearing menu, select PDF/X.

3. Go back to Kotobee Author, and use the newly saved PDF file.

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This may help you,

Rachel Gomez

****THE POST HAS BEEN EDITED: TIPS NOT RELATED TO AUTOCAD FOR MAC HAVE BEEN CROSSED OUT****