I have a simple problem of interpolation but I don't understand why.
Like you can see on the picture I would like to make an interpolation on the layer "main" between the key 1 and the key 31. On this layer I have a draw that I put in a group (not a symbol). WHen I do a simple translation, that works. But when I do a rotation, that don't work; I have a weird movement on the biginning what looks like not the movement I want, and POUF when I arrive on the last frame (31) that jump on the programmed position.
I never had this problem before, somebody can help me ?
P.S: I don't speak currently english and my interface is in french ^^ so if you could explain me with simple words =3 ......thanks
If you want to use Classic Tweens ('interpolation' as you call them in French) you must use Symbols.
You must have only one symbol per layer and you should not move the Transformation point in either of the keyframes.
You cannot have just a group and tween it. What happens most likely is that Animate generates automatically two symbols and this creates more problems.
Here is a whole article about Symbol registration, 'broken' tweens and how to fix them.
Hopefully you will be able to read it with google translate and also watch the video with automatically generated subtitles.