While there is no maximum layer enforced on PCs, your experience may degrade based on your PC's capabilities. On mobile devices, we will enforce a limitation on the number of layers to prevent a degraded experience.
As we continue to improve the performance of the Insignia Tool on mobile devices, we will extend the maximum number of layers available on projects opened with a mobile device.
This does mean that some projects that were made on PCs will not be available to be loaded on mobile devices. You should see that tool when browsing your projects.