PDF Tron issue on Android devices

Hello, I am working on a Hybrid app for Android. After deeper testing I noticed that from some reason PDF tron doesn't work. I can open PDF file but if I want to change PDF file (for example, user want to change something in file...) I can not do that.   Does anybody have any idea what could be a problem? On Apple devices, PDF tron works well.    Regards, David.  
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