Failed to export icons when building iOS, if iPhones Settings @2x, @3x, iPads Settings @2x are not set

[lucast922]

Hi! I have an issue when building iOS with the package, while some icons are not set. And, I think these icons should not be compulsory.

According to document from Apple, only the following icon sizes are compulsory for iMessage:

• 1024x768
• 120x90
• 180x135
• 134x100
• 148x110
• 54x40
• 81x60
• 64x48
• 96x72
  Reference: https://developer.apple.com/library/archive/qa/qa1686/_index.html

But the code from the current latest package, it also requires:

• 58x58 iPhone Settings @2x
• 87x87 iPhone Settings @3x
• 58x58 iPad Settings @2x
  But seems they should be just optional according to apple document. Otherwise we will need some dummy Texture2D object here or I will get null reference and fail to build with stickers when exporting these icons when building iOS in Unity. As current code here expect these 3 icons always exists. Correct me if I misunderstand something. Thanks!