Proper method of loading custom particle systems from Json?

I found a solution!

  1. Was just me pressing ‘embed texture’ without realizing it when exporting from the editor. When selecting NO the string is just the file name.
  2. Managed to change the path by changing the url for BABYLON.ParticleSystemSet.BaseAssetsUrl. The texture now loads offline from the project files.

This thread also goes into more detail about that.