I’m making a Blender add-on to easily get spritesheet animation to sketchfab. To my knowledge its a known issue that you cant get constant/stepped interpolation to animations when exporting to sketchfab from blender.
Though, if you click the time in the sketchfabs UI so that it plays by frames the animation plays as intended. Would it be possible to set which of those is the default (seconds or frames) for example in the 3D settings area, so when someone views the model it would show the animation in frames by default?
Here’s an example model I uploaded.