The WorldEdit command //image appears to not be functioning correctly.
MechanicalDog has tried using it, but received an error message asking for the creation of a directory FastAsyncWorldEdit/textures. I created this directory. The error message goes on to ask for a jar file, so I put that in as well, at FastAsyncWorldEdit/textures/.minecraft/versions/1.13.jar.
After I did what it asked, it spit out a separate error.
I can confirm the server does have read access to that area. I tried putting the file directly into the textures directory, and also tryed a 1.13.2 jar as well, all with the same result. A "bound must be positive" warning gets spammed console over and over, and a single pumpkin is placed down in the world.
Mech says that the //image function used to work back on Create. Perhaps Hex could look at how it is configured there?