I spent over 4 hours just trying to get a really simple animation to work.
I did not just try to do this from memory - as I worked, I re-read the tutorial many times.
For the discussions below, I am ignoring sounds and other functions that can be attached to frames.
Statement of the Problem
In general, animations should contain multiple layers
Images are attached to keyframes.
You can simulate motion by making every frame a keyframe and placing a unique image on each. This is time consuming and inefficient. Flash allows you to place multiple undefined frames between the keyframes and then to define a tween to automatically animate your movie.
This is a perfect example of why the built-in help is worthless - I typed in tween and got about 1,000 returns (about 25 returns per scroll and 40 clicks of the scroll bar to see them all). I think they want you to read them all. Note that the search returned all instances of tween, tweened, and between (give me a break).
When you start a new animation (a flash file - *.fla), Flash starts with a single empty keyframe in Layer 1 of the Timeline. A keyframe is indicated with a circle - if nothing is attached to the keyframe, then the circle is empty ... when you draw something on the Stage (canvas), the circle is filled.
A sequence is the number of frames that a given tween (collection of images) will render - it contains all the frames between 2 keyframes. Each sequence starts with a circle and ends with a rectangle. The "keyframe" is the frame that contains the circle.
To delete a frame, or a keyframe, right click and select
|Select from menu
|This will remove all the highlighted (selected) frames
|Remove the instance of the highlighted (selected) keyframe. This option is greyed out unless a keyframe is selected.
|When working with frames - do not use the delete key. Hey, it makes sense to click on a frame and remove it via the Delete key. However, in Flash, the delete key removes every thing drawn on the frame - not the frame itself.
If you click and drag, you will highlight (select) multiple frames. Control and Shift can be used to extend a selection.
When you draw a rectangle, the outline and the colored insides are normally drawn as 2 separate objects. In this case, the 2 objects can be moved independently. Depressing this button will generate a single object.
In the dialog box, there is a graphic with 9 small squares. The selected square indicates the point controlled by the 3:06 AM 12/12/2007x and y values in the Property frame. This point is displayed as a small plus sign when the object is selected. I have never found a way to edit this, except to create a new object by using Convert to Symbol... again.
Create an object, right click it, select Convert to Symbol..., select Movie clip, and select OK.
Use Onion Skin to view all the frames between the markers at the same time