Microsoft DELETED the suggestion for returning to the previous Onedrive PDF annotation
The post of over 1000 votes requesting that onedrive restore its original editing capabilities (notes, highlighter, pen layout, blue side toolbar) was deleted by Microsoft.
There was a claim that the 'annotation experience' would be improved, but this never occurred.
The app is still much worse than it was (went from a beautifully made app, to highly tedious to annotate PDFs).
Tao Large commented
For those voting on this, there is another suggestion with more votes here, and it might be helpful to all vote on that suggestion so that it reaches to 500 vote threshold for receiving a response: https://onedrive.uservoice.com/forums/913519-onedrive-on-ios/suggestions/35867293-pdf-tool
Larsen Günther commented
Please listen to users' advice commented
What Microsoft has done is really disgusting. Shame on you, Microsoft.
The app has become so difficult to use! And so limited in capabilities... Considering that people pay for storage, they should have the option to use the previous Onedrive version.