The reason I gave this app one star is because how it handles app switching on iPad Pro – PDF Viewer - Annotation Expert Review

The reason I gave this app one star is because how it handles app switching on iPad Pro. When annotating a PDF file in this app, I cannot safely switch to a different app. If I ever try to use the screen bottom app switcher, inevitably, I will touch the page slider bar at the bottom of this app. Then the page I'm viewing will inevitably jump to other pages. This design flaw is so annoying. I have to stop using this app and go back to PDF expert for better user experience. I will update this review to 3 stars if the developers fix the design flaw I mentioned above. (Update: It's fixed now. So the review is updatedto 3 stars as I promised.) And BTW, the line drawing function in PDF expert is far more superior than this app: Lines in PDF expert will automatically align to horizontal or vertical direction. And the lines will even align to themselves. These whole bunch of features are missing in this app. Yet this app charges us yearly? Broken deal. I will update the score to 4 if this app charge once, and offers the same experience and functionality as PDF expert. And update it to 5 if this app has the same wonderful Mac OS version as PDF expert. Till then, this app is overpriced and sub-functional.
Review by Dr.Costard on PDF Viewer - Annotation Expert.