Flow: a component's steps, in a row
A keyframe says what a property is at a moment. It does not say that the button pops in, gets clicked, turns into Subscribed and leaves. Flow says that — and keeps the keyframes underneath, so both stay true.
The steps, where the timeline was
The editor has three modes now: Simple, Flow and Expert. Flow takes the place the timeline takes and shows the selected component's steps in order — Start, the component itself, then Appear, Hold, Click, Change, Sound and Leave, as many as it has. Under the row, a strip of the same steps on the clock, and under that every part of the component and what it is doing on that same clock.
Each step can be opened. The panel on the right says what it does in words — a cursor arrives and clicks it — how long it lasts, and has Play this step to watch only that part. Steps can be rearranged, added between, or taken out. A sequence runs one step after another; it has no branches or loops, and a longer one grows the project, up to sixty seconds.
When it starts
The first step says when the component starts: at the start, at a time, or at a marker. A start set at a marker follows the marker, so dragging the marker to where the line is actually said moves the whole sequence with it.
Markers can come from your own material. Find the moment reads captions or a pasted transcript and offers to start when a phrase is said; it reads music and offers markers on every beat or every bar. Nothing is uploaded — the files are read on this computer, and nothing of them is kept.
Templates become steps under their own name
A template with a known motion can be turned into steps. Flow names it — this is the Subscribe Pop template — and offers Convert to Flow or Keep as keyframes. Converting moves nothing on screen, keeps the template's name, and is undone with a single ⌘Z.
A template whose words are part of its motion stays in keyframes, and Flow says so rather than offering something it cannot do well.
Nothing lost between steps and keyframes
Fine-tune keyframes opens the keys a step made, in Expert. Change them by hand and the step card says Edited, and how many places were changed. If a step is changed again later, you are asked rather than overruled: keep your edits, replace them, or make those lines your own so the step leaves them alone. In Expert, a key says whether its step made it or somebody changed it by hand since.