Paraview Glance - loading multiple files

Are you still trying the state.json file you’ve attached in your previous post? Or are you re-generating your glance file via the save state button? if you’re using your aforementioned state.json file, you need to modify your sources object like so:

"id": "6",                 
"group": "Sources",        
"name": "TrivialProducer", 
"props": {                 
    "name": "test.nii",    
    "type": "vtkImageData",
    "dataset": {           
        "name": "test.nii",
        "url": "....."
    }                      

Easiest way is to still re-generate the glance file.