coordinate system - Unable to snap vertices and segment in QGIS 3.0

I'm unable to snap 2 polygons in QGIS 3.0. I tried snapping 2 polygons from the same layer and also 2 polygons from different layers.

I ensured that snapping is enabled in the Settings>>Options>>Digitizing tab, and increased the snapping distance.

I could not locate any 'snapping settings' at the layer level. Layers are projected.