I don't organize at the file level. I just dump all pdf files into a folder. That folder syncs with home-server and cloud-storage. I organize at the app level.

I don't organize at the file level. I just dump all pdf files into a folder. That folder syncs with home-server and cloud-storage. I organize at the app level. I have different apps on all my devices for different kinds of documents. One for work/research, one for novels/non-fiction/poetry. I rely on the recently opened section for continued reading. All of the apps have big book-shelf features, so the title doesn't matter. When transfering, I sometimes email the document to myself with the title in the subject. I use Okular, native doc viewer in Pop OS, Ebookdroid and Ebookdroid Pro.