While it’s been true for months now, I would be remiss not to make note here of the wonderful new PDF Annotation features within Zotero 6. (And the newest version of the Zotero mobile apps.) Saved PDFs of books and articles now open within a tab in Zotero, and it has robust annotation tools built in. This streamlines my previous workflow tremendously.
Here’s a helpful recap explaining how to make annotations into notes within Zotero 6 — truly an amazing tool for researchers in any field.