Problem:

You uploaded EPUB file to Google Play Books but received Processing Failed error message.

Solution:

1. Open https://www.zamzar.com.
2. Click Choose Files and select EPUB file.
3. Click Convert To and select azw3.
4. Click Convert Now button.
5. Download the azw3 file.
6. Return to https://www.zamzar.com.
7. Click Choose Files and select azw3 file.
8. Click Convert To and select EPUB.
9. Click Convert Now button.
10. Download the EPUB file.
11. Upload the EPUB file to Google Play Books.

Note: https://www.zamzar.com offers only 2 free daily conversions.