I have been co-operating with @JCPalmer on getting shape key animations exported from Blender 2.9+ . So far - nothing. But Jeff and I have found out that if exported as a GLB file and loaded into the sandbox, the animations will work. We need that in the Babylon exporter.
Now if the GLB file is exported from the sandbox as a .babylon file and that file is viewed then you can see the animations for the three shape keys show up as a morphTargetManager array of animations. How do you get that whole array to play at once? (see image blow).
Jeff thinks it needs some kind of modifications to babylon - here to allow for the complete array to play (as I understand him). So any thoughts from the powers that be (@Deltakosh ) that could help?
I hate to keep nagging Jeff!
Stay Safe All, gryff
From the exported GLB-> Babylon file (note the three animation components of the array)