Go ahead. FA has instituted a new way to even sort them by theme or story, if you have multiple separate chapters.

Do you know if I have to upload it directly as a file type or can I copy and paste? I often work from google docs and then copy, paste and fix formatting in DA and Pixiv where I already upload.

I know that FA can handle .pdfs, so that would be how I would recommend that you upload your stories. There are plenty of free .pdf converting softwares out there and it protects your work.
For example: https://www.furaffinity.net/view/279353/

FA does also accept .rtf (Rich Text Format), .doc (Word Format) and .txt (Text Format). Reading a story on FA in Text Format is somewhat difficult and often loses some of it's formatting, so I don't recommend it. It can be a distraction for the reader and that takes away from the work of writing a delightful story, righ?

Did that answer your question?

Hmm somewhat. I'll have to play with it. I would like to leave my content for as many people to enjoy but in general would prefer to leave it on the site rather than working through a third party sort of thing like a pdf.