Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.72
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-31 07:46, hash: rB645fc0c76794
Worked: (newest version of Blender that worked as expected)
Short description of error
Inconsistancy in the Annotation tool doesn't work the same way in all modes.
Exact steps for others to reproduce the error
In 3D (general) : it's quite fine.
the annotation Tool have the layers options (only on the 3D side view), and the keyframes are visible in the dopeSheet.
In 2D animation mode : the annotation Tool have the layers options, but the keyframes are invisible in the dopeSheet
In VSE : the annotation Tool don't have the layers options, but the keyframes are visible in the dopeSheet