Edge
Safari
Firefox
DuckDuckGoElement opacity, fill layer opacity and color alpha are three separate controls, and only one of them is usually the right one to keyframe. For a whole-element fade, animate element opacity — it composites all fills, the stroke and the shadow together before blending.
If one or more of these match what you are seeing, you are on the right page.
Ordered from most to least likely. Work down the list — each cause is paired with what to do about it.
Fill layer opacity affects one layer of the material stack. Keyframe element opacity for a fade of the whole element including stroke and shadow.
The three controls multiply. A fade from 100% to 0% on element opacity is invisible if a fill layer beneath is already at 0%, and vice versa.
A group with any blend mode other than Pass-through composites internally before blending as a unit. Set it to Pass-through, or animate the group opacity instead of the member.
Hold keyframes jump rather than interpolate, producing a hard cut instead of a fade. Right-click and toggle them to standard keyframes.
Enable it with Ctrl+Alt+R, or click the diamond next to the opacity field in the Properties Panel to keyframe that one property directly.
If none of the causes above match, contact support with the steps to reproduce the problem, your browser and version, and any message from the browser console. You can reach us at support@flashfx.app.
Contact Support