diff --git a/config.yaml b/config.yaml
index 1399cee..e57728c 100755
--- a/config.yaml
+++ b/config.yaml
@@ -9,6 +9,7 @@ service:
   operations:
     conversion:
       input:
+        multi: False
         subdir: ""
         extension: ORIGIN.pdf.gz
       output:
@@ -16,6 +17,7 @@ service:
         extension: json.gz
     extraction:
       input:
+        multi: False
         subdir: ""
         extension: ORIGIN.pdf.gz
       output:
@@ -23,6 +25,7 @@ service:
         extension: json.gz
     table_parsing:
       input:
+        multi: True
         subdir: "pages_as_images"
         extension: json.gz
       output:
@@ -30,6 +33,7 @@ service:
         extension: json.gz
     image_classification:
       input:
+        multi: True
         subdir: "extracted_images"
         extension: json.gz
       output:
@@ -37,6 +41,7 @@ service:
         extension: IMAGE_INFO.json.gz
     default:
       input:
+        multi: False
         subdir: ""
         extension: in.gz
       output:
diff --git a/scripts/show_compressed_json.py b/scripts/show_compressed_json.py
index 86ea339..57976dc 100644
--- a/scripts/show_compressed_json.py
+++ b/scripts/show_compressed_json.py
@@ -14,7 +14,10 @@ def parse_args():
 
 
 def interpret(parsed):
-    return {**parsed, "data": str(string_to_bytes(parsed["data"]))}
+    try:
+        return {**parsed, "data": str(string_to_bytes(parsed["data"]))}
+    except KeyError:
+        return parsed
 
 
 def main(fp):