Keep a figure in the figure panel while you read on, and put the original PDF page or a second paper beside the one you are reading. No more scrolling back and forth.
In Reading Mode, the side-by-side button at the top, or a long press on the round button, puts the original page next to the reflowed text. Your marks show on both.
Open the figure panel from the top bar, and the figure or table nearest your page appears beside the text. In Reading Mode, the pin on a figure card sends that figure to the panel.
With the figure in the panel, you never have to scroll back to its page.
Long-press a paper in the library and choose Open in right pane. The right pane is for reading; you write in the left one.
Tap a citation such as [12] to see the reference. If it's in your library, Open with my notes brings it up with your own notes.
Rectoly runs on Android phones, tablets and E Ink devices such as Boox. The app comes from this site, and one purchase covers it together with iPad, Windows and Mac.