In December of this past year, I began crafting full reference notes for each of the deeds involving my ancestors, regardless of their role in the deed. I arranged all the deeds for each ancestor in chronological order and also wrote notes of importance with the Reference Note. The listing can be saved as a PDF and attached to that person's profile at Ancestry. It really makes it easy when you start writing about your ancestors as well, because you already have these citations and can copy and paste them to source your work. I use Google Docs and then save/download a copy of the PDF, but you could create the PDF on-site at Ancestry. I do that sometimes.
I completed this process for the profile of my 2nd Great Grandfather, Wm Clifford Cook as well as the profile of his maternal 1st cousin, William Green Hight. While researching Wm G. Hight's deeds, I also found additional information on his marriages and divorces that occurred after his first wife's death and his move to Arkansas. He lived in Washington County, Arkansas, before moving to Franklin County, Arkansas(the location he was living at when he passed). Sometimes, I also create a PDF with information about my research that I want to preserve (e.g., notes on Census entries, conflicting evidence, proof statements, or proof arguments, etc.)
