diff --git a/crc/api.yml b/crc/api.yml
index 5e79cfc9..52014447 100644
--- a/crc/api.yml
+++ b/crc/api.yml
@@ -362,21 +362,15 @@ paths:
               schema:
                 $ref: "#/components/schemas/File"
     put:
-      operationId: crc.api.file.update_file
+      operationId: crc.api.file.update_file_info
       summary: Update a file
       tags:
         - Files
       requestBody:
         content:
-          multipart/form-data:
+          application/json:
             schema:
-              type: object
-              properties:
-                workflow_spec_id:
-                  type: string
-                file:
-                  type: string
-                  format: binary
+              $ref: "#/components/schemas/File"
       responses:
         '200':
           description: Metadata about the uploaded file, but not the file content.
@@ -401,7 +395,7 @@ paths:
         schema:
           type: integer
     get:
-      operationId: crc.api.file.get_file
+      operationId: crc.api.file.get_file_data
       summary: Returns only the file contents
       tags:
         - Files
@@ -414,6 +408,29 @@ paths:
                 type: string
                 format: binary
                 example: '<?xml version="1.0" encoding="UTF-8"?><bpmn:definitions></bpmn:definitions>'
+    put:
+      operationId: crc.api.file.update_file_data
+      summary: Update only the file contents for a given file
+      tags:
+        - Files
+      requestBody:
+        content:
+          multipart/form-data:
+            schema:
+              type: object
+              properties:
+                file:
+                  type: string
+                  format: binary
+      responses:
+        '200':
+          description: Returns the actual file
+          content:
+            application/octet-stream:
+              schema:
+                type: string
+                format: binary
+                example: '<?xml version="1.0" encoding="UTF-8"?><bpmn:definitions></bpmn:definitions>'
   # /v1.0/workflow/0
   /workflow/{workflow_id}:
     parameters:
diff --git a/crc/api/file.py b/crc/api/file.py
index 85b70f82..8f33b158 100644
--- a/crc/api/file.py
+++ b/crc/api/file.py
@@ -60,7 +60,7 @@ def add_file():
     return FileModelSchema().dump(file_model)
 
 
-def update_file(file_id):
+def update_file_data(file_id):
     file_model = session.query(FileModel).filter_by(id=file_id).with_for_update().first()
     if file_model is None:
         return ApiErrorSchema().dump(ApiError('no_such_file', 'The file id you provided does not exist')), 404
@@ -68,7 +68,7 @@ def update_file(file_id):
     return FileModelSchema().dump(file_model)
 
 
-def get_file(file_id):
+def get_file_data(file_id):
     file_data = session.query(FileDataModel).filter_by(id=file_id).first()
     if file_data is None:
         return ApiErrorSchema().dump(ApiError('no_such_file', 'The file id you provided does not exist')), 404
@@ -87,6 +87,23 @@ def get_file_info(file_id):
     return FileModelSchema().dump(file_model)
 
 
+def update_file_info(file_id, body):
+    if file_id is None:
+        error = ApiError('unknown_file', 'Please provide a valid File ID.')
+        return ApiErrorSchema.dump(error), 404
+
+    file_model = session.query(FileModel).filter_by(id=file_id).first()
+
+    if file_model is None:
+        error = ApiError('unknown_file_model', 'The file_model "' + file_id + '" is not recognized.')
+        return ApiErrorSchema.dump(error), 404
+
+    file_model = FileModelSchema().load(body, session=session)
+    session.add(file_model)
+    session.commit()
+    return FileModelSchema().dump(file_model)
+
+
 def delete_file(file_id):
     session.query(FileDataModel).filter_by(file_model_id=file_id).delete()
     session.query(FileModel).filter_by(id=file_id).delete()
diff --git a/crc/workflow_processor.py b/crc/workflow_processor.py
index d1b06c69..1f277663 100644
--- a/crc/workflow_processor.py
+++ b/crc/workflow_processor.py
@@ -72,7 +72,7 @@ class WorkflowProcessor:
                 dmn: ElementTree.Element = ElementTree.fromstring(file_data.data)
                 parser.add_dmn_xml(dmn, filename=file_data.file_model.name)
         if process_id is None:
-            raise(Exception("There is no primary BPMN model defined for workflow " + workflow_spec_id))
+            raise(Exception("There is no primary BPMN model defined for workflow %s" % workflow_spec_id))
         return parser.get_spec(process_id)
 
     @classmethod