The ability to organise annotations by 'category' (and the ability to label those categories/colours) would be very useful.
Also the ability to show only certain types of annotations - e.g. notes only or highlights only (or even only blue highlights!)
I use the highlight colours consistently across my references, e.g. yellow=objectives, purple=results,... It would be great to be able to search or export the hightlights by a specific colour. Or have the type of highlight (highlight colour, underline colour) appear in the csv export file.
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