RSS feeds, Twitter (or emails from colleagues) give me a raw list of papers to read. Using the url of whatever journal webpage as a basis it then gets converted to a doi by the Zotero translation server (hosted as a lambda on AWS). From there its the crossref API to generate a filename for the PDF, and then Elbakyan's resource to download the actual file (even though I'm usually on an academic network that has full access, the scihub api is cleaner). All this gets launched from the share sheet from the browser, and deposits files in a cloud drive.
A little bit off topic, but could anyone explain to me the actual utility of a reference manager if all your references have dois? I don't get what it provides over a folder of PDFs with annotations?