diff --git a/src/microcosm/__init__.py b/src/microcosm/__init__.py
index 52a1a94..8d2c9b0 100644
--- a/src/microcosm/__init__.py
+++ b/src/microcosm/__init__.py
@@ -34,6 +34,9 @@ ENTITY_TYPE_PLURAL_MAP = {
 
 core_bp = Blueprint("core", __name__)
 
+class InvalidRequestException(Exception):
+    """Class of exception raised when the server receives an invalid request"""
+
 
 def create_app():
     app = Flask(__name__)
@@ -52,6 +55,7 @@ def create_app():
     app.register_blueprint(core_bp)
     app.register_blueprint(webhook_bp)
 
+
     return app
 
 
@@ -80,7 +84,8 @@ def authed_endpoint(f):
 
 _api_client = None
 
-
+class InvalidRequestException(Exception):
+    """Invalid Request"""
 
 
 def process_photo_url(created_at: datetime, doc: Dict[str, List[str]], suffix: str = ""):
@@ -96,6 +101,13 @@ def process_photo_url(created_at: datetime, doc: Dict[str, List[str]], suffix: s
     
     for i, photo in enumerate(doc['photo']):
 
+        if isinstance(photo, dict):
+            photo_url = photo['value']
+        elif isinstance(photo, str):
+            photo_url = photo
+        else:
+            raise InvalidRequestException()
+
         if os.environ.get('MICROPUB_IMAGE_STRATEGY') == 'copy':
             # download the photo
 
@@ -235,6 +247,12 @@ def capture_frontmatter_props(doc: Dict[str, Union[str, List[str]]], frontmatter
             else:
                 frontmatter[key] = doc[key]
 
+    if 'hypothesis-link' in doc:
+        # get the hypothesis data and store it
+        r = requests.get(doc['hypothesis-link'][0])
+
+        frontmatter['hypothesis-meta'] = r.json()
+
     if 'category' in doc:
         if isinstance(doc['category'], list):
             categories = doc['category']
@@ -311,6 +329,25 @@ def process_multipart_post():
     return docstr, frontmatter, file_path
 
 
+def process_image_alt_texts(doc):    
+
+    alts = []
+
+    if isinstance(doc['photo'], str):
+        doc['photo'] = [doc['photo']]
+
+    
+    for i, photo in enumerate(doc['photo']):
+
+        if isinstance(photo, dict):
+            alts.append(doc['alt'])
+        else:
+            alts.append("")
+
+    return alts
+
+        
+
 def process_json_post():
     """Process JSON POST submission"""
 
diff --git a/src/microcosm/photo.py b/src/microcosm/photo.py
new file mode 100644
index 0000000..e69de29