Optimising Textures

Import sizes for textures vary based on the feature: 
Refer below for texture sizes.

Project Thumbnails:
Format: JPEG or PNG 
iPad Dimensions 346px * 242px
iPhone Dimensions 410px * 282px. 
Max size: 2mb

Custom Icons for Layers 
Format: JPEG or PNG 
Texture Dimensions:  512px * 512px 
Max size: 1mb ​

Custom Logo for Info Tab: 
Format: JPEG or PNG 
Texture Dimensions:  512px * 512px 
Max size: 1mb 

Material Palette Textures: 
Format: JPEG or PNG 
Texture Dimensions:  2048px x 2048px  
Max size: 2mb