Cannot export certain 4096 textures

unit23 · March 25, 2016, 7:11pm

For some reason i am not able to export 4096 textures. On export there is a brief progress bar, but no file output.

This only happens with certain Roughness textures

These textures are part of LuosCave pack. It was no problem to export other 4096 textures of this pack.

Images tested are in PNG format
File size is around 24mb

Update
This might be due to the files are in PNG format, but Unreal Engine seems to be unable to export PNG (or convert to TGA), upon exporting.

Forum thread Luos's Modular Rocks & Cave package - Marketplace - Unreal Engine Forums

Luos · March 25, 2016, 9:29pm

see the forum post about this

unit23 · April 12, 2019, 5:05am

Still an issue Emissive and Opacity Textures cannot be Exported or Resized - Rendering - Unreal Engine Forums

unit23 · April 13, 2019, 9:35am

To fix circumvent any texture issues, the Bake out Materials option inside the SMesh panel generates textures which are completely compatible and optimized.