Thumbnails in viewers

When I try to use Universal Viewer only one thumbnail appears on the left pane under “Thumbnails” but all three are listed under “Index”.
I have noticed that in the Json code the “SC:” is missing in front of Manifest or any other thing other manifest seem to show the “SC:” in front of. What does the “SC:” mean and why is it not being produced by my Omeka S setup running in Docker until we figure out how to get this working correctly.

@context: “http://iiif.io/api/presentation/3/context.json
id: “http://devlibrarymedia/iiif/3/85/manifest
type: “Manifest”
label:
none:
0: “p34a”
metadata:
0:
label:
none:
0: “Title”
value:
none:
0: “p34a”
requiredStatement:
label:
none:
0: “Attribution”
value:
none:
0: “Provided by Example Organization”
thumbnail:
0:
id: “http://devlibrarymedia/files/medium/a4bda4f72ec14166b9771a615d4f01ab06946dca.jpg
type: “Image”
format: “image/jpeg”
width: 133
height: 200
viewingDirection: “left-to-right”
seeAlso:
0:
id: “http://devlibrarymedia/api/items/85
type: “Dataset”
label:
none:
0: “application/ld+json”
format: “application/ld+json”
profile: “http://devlibrarymedia/api-context
homepage:
0:
id: “http://devlibrarymedia/api/items/85
type: “Text”
label:
none:
0: “p34a”
format: “text/html”
language:
0: “en_US”
items:
0:
@context: “http://iiif.io/api/presentation/3/context.json
id: “http://devlibrarymedia/iiif/3/85/canvas/p1
type: “Canvas”
label:
none:
0: “p34a”
metadata:
0:
label:
none:
0: “Title”
value:
none:
0: “p34a”
requiredStatement:
label:
none:
0: “Attribution”
value:
none:
0: “Provided by Example Organization”
thumbnail:
0:
id: “http://devlibrarymedia/files/medium/a4bda4f72ec14166b9771a615d4f01ab06946dca.jpg
type: “Image”
format: “image/jpeg”
width: 133
height: 200
height: 7560
width: 5011
items:
0:
id: “http://devlibrarymedia/iiif/3/85/annotation-page/86
type: “AnnotationPage”
items:
0:
id: “http://devlibrarymedia/iiif/3/85/annotation/86
type: “Annotation”
motivation: “painting”
body:
id: “http://devlibrarymedia/i…ll/530,800/0/default.jpg
type: “Image”
format: “image/jpeg”
service: […]
height: 7560
width: 5011
target: “http://devlibrarymedia/iiif/3/85/canvas/p1
label:
none: […]

This may be an issue with the IIIF Server, Image Server, and/or Universal Viewer modules. You can submit issues with the maintainer here, here, and here,