I have a PDF file with both a basemap and a large number of paths on top of it, which I've edited in Adobe Illustrator.
How should I separate the basemap and add the paths as polygon features to a feature layer in ArcGIS Pro?
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Answering my own question as I figured it out somewhat well.
As I mentioned, the map was quite complex and slow to edit, as it included both the basemap (with 1000+ paths) and the paths that I wanted to export in a same file.
I hand-picked each and every path to be exported, and separated them onto four different layers, depending on the type. I also separated the city's borders from the base map to be used as a control point.
Then, I deleted the original basemap from the file, and exported it as a DXF file, which I then imported to ArcGIS Pro as a CAD layer. I georeferenced the layer against the city's WMS map using corners from the city's borders at opposite ends as control points.
I however couldn't figure out how to convert the CAD feature layer to a normal feature layer to enable editing of the feature attributes, so I ended up exporting the whole map as a KML file to Google My Maps (which would have been its final destination anyways) and did the final editing and classification there.