IOS BETA Feature Suggestion: PenWrite

Dear developers for Zotero (ios):

I am currently using the beta version in TestFlight. You did really good work on the current beta version, while I found one feature which could be important but missing:

I would highly suggest the Penwrite feature so that users could draw and sketch on the PDF pages directly (with different color and linesize settings, just like those note-taking apps). With the aid of iPencils, the tool would be efficient and powerful and highly-appreciated.
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