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Can't recognize PDF of version 2.0, 1.4
all test under droid 6.5 pdf versions can be seen on the website: https://www.prepressure.com/pdf/basics/version
1、droid cann't recognize pdf of version 2.0 PDF 2.0 (ISO 32000-2) Availability: August 2017
2、pdf of version 1.4 is recognized as version 2b, but not 1.4
wish this problem can be resolved.