WRT 2 about recognizing indexes … Few PDF apps work fully to standards set by Adobe products. Each has its own pitfall. Some issues may be from limitations in being tied to the macOS implementation of PDF (PDFKit???). For reference, I’ve fought a long recent battle on the LaTeX side simply to get a PDF file where the standard meta-tags (e.g. title, author, keywords …) are consistently found across any PDF application on macOS and Windows.
WRT to 1 about “coming soon” statements from 2019 … developers have had to accommodate for a fight against COVID and a fight against Russians. I’m inclined to give broad grace.
In my own experience, I continue to work with PDFExpert on my iPad to markup reports from my team as well as to grade assignments from students. I appreciate the robust, seamless integration with cloud services and the intuitive approach to manage file administration (changing names, labelling with color tags). I appreciate the ability to set up an annotation tool bar with favorites on the left side of the iPad view. Most recently, I appreciated the ability to manipulate the PDF pages on the iPad.
Granted, sometimes with heavy lifting (e.g. markup grading across 30+ reports in one sitting), the app will “hang”. Quitting and swiping the app off the active list on the iPad clears the issue.
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JJW