Note: This is about one particular functionality that the ZotFile plug-in offers for Zotero users – it does other cool stuff as well.
ZotFile is freeware, but if you like it, you may want to donate to the creator. ZotFile works with both iOS and Android tablets, but you can also use some of its functionality even if you don’t have a tablet.
iPad users who use other iOS Zotero apps such as PaperShip: If you use PaperShip, you don't need to use the syncing functionality of ZotFile as you can access and annotate your PDFs via your iPad (of course, you can also do this directly at zotero.org via your tablet's browser); however, you may still want to install it on your computer to use for things like extracting PDF annotations to a Zotero Note.
Note: Your PDF will now have annotations on it, but there may be times when you want to print it out without your annotations. On my Windows machine using Adobe Acrobat Reader (or whatever its called this week) you can always print it out clean without your annotations/markups if you need to - look at the drop-down menu with the title Comments & Forms - it will let you print your document without markups (you can also delete annotations made via the PDF Expert or other pdf annotation tool using Adobe Acrobat Reader on your laptop, print out the document, then close the PDF without saving it).
Note: As of 2/4/2021, Zotfile's options to "save a copy of the annotated file with suffix _annotated" and "automatically extract annotations wihen getting PDF back from tablet" are not working, even if selected, so they are not included in this guide.
Available in alternative formats on request; last revised: 2/4/2021 Lorena O’English email@example.com