diff --git a/henry/collection.py b/henry/collection.py
index 417e7d9..2c74360 100644
--- a/henry/collection.py
+++ b/henry/collection.py
@@ -19,6 +19,8 @@
 
 
 class CollectionInstance(BaseModel):
+    collection_id: str | None
+
     pass
 
 
@@ -159,7 +161,7 @@ def _upload(
             return self.colleciton_id
 
         if not skip_preflight:
-            # This runs _all_ preflight checks - for all connected collecitons and products.
+            # This runs _all_ preflight checks - for all connected collections and products.
             self.preflight()
 
         self.collection_id = collections.create(
@@ -295,7 +297,7 @@ def pull(
         )
 
     @classmethod
-    def read(cls, directory: Path | str, allow_incomplete: bool) -> "RemoteProduct":
+    def read(cls, directory: Path | str, allow_incomplete: bool) -> "RemoteCollection":
         """
         Read a collection that was serialized to disk, usually with the
         `henry collection download $ID` command.
@@ -493,7 +495,9 @@ def _upload(
             )
 
         product_ids_to_connect = [
-            p.id for p in self.products if p.id not in self.original_product_ids
+            p.product_id
+            for p in self.products
+            if p.product_id not in self.original_product_ids
         ]
 
         for product_id in product_ids_to_connect:
@@ -515,7 +519,9 @@ def _upload(
 
         # Recurse!
         child_collection_ids_to_connect = [
-            c.id for c in self.collections if c.id not in self.original_collection_ids
+            c.collection_id
+            for c in self.collections
+            if c.collection_id not in self.original_collection_ids
         ]
 
         for collection_id in child_collection_ids_to_connect:
diff --git a/henry/core.py b/henry/core.py
index 3bc2d43..6662854 100644
--- a/henry/core.py
+++ b/henry/core.py
@@ -11,7 +11,7 @@
 from hippometa import ALL_METADATA_TYPE
 
 from .collection import CollectionInstance, LocalCollection, RemoteCollection
-from .product import LocalProduct, ProductInstance, RemoteProduct
+from .product import LocalProduct, ProductInstance, RemoteProduct, RevisionProduct
 
 
 class Henry:
@@ -66,7 +66,9 @@ def new_collection(
         )
 
     def push(
-        self, item: LocalProduct | LocalCollection, skip_preflight: bool = False
+        self,
+        item: LocalProduct | LocalCollection | RevisionProduct | RemoteCollection,
+        skip_preflight: bool = False,
     ) -> str:
         return item._upload(
             client=self.client,
@@ -99,7 +101,7 @@ def pull_collection(
         collection_id: str,
         realize_sources: bool = True,
         pull_children: bool = True,
-    ) -> CollectionInstance:
+    ) -> RemoteCollection:
         return RemoteCollection.pull(
             collection_id=collection_id,
             client=self.client,
diff --git a/henry/product.py b/henry/product.py
index a887735..f886388 100644
--- a/henry/product.py
+++ b/henry/product.py
@@ -15,6 +15,8 @@
 
 
 class ProductInstance(BaseModel):
+    product_id: str | None
+
     pass
 
     def _upload(
diff --git a/hippoclient/core.py b/hippoclient/core.py
index 31f9f03..8d8e9e2 100644
--- a/hippoclient/core.py
+++ b/hippoclient/core.py
@@ -60,7 +60,7 @@ class ClientSettings(BaseSettings):
     @classmethod
     def settings_customise_sources(
         cls,
-        settings_cls: BaseSettings,
+        settings_cls: type[BaseSettings],
         init_settings: PydanticBaseSettingsSource,
         env_settings: PydanticBaseSettingsSource,
         dotenv_settings: PydanticBaseSettingsSource,
diff --git a/pyproject.toml b/pyproject.toml
index db9d090..022d39c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,7 +15,7 @@ hipposerve = ["web/static/*.svg", "web/static/*.ico", "web/static/*.png", "web/t
 [project]
 name = "pyhippo"
 description = "The Hierarchical Product Post Office, developed for the Simons Observatory."
-version = "0.2.9"
+version = "0.2.10"
 readme = "README.md"
 requires-python = ">=3.11"
 dependencies = [
diff --git a/tests/test_client/conftest.py b/tests/test_client/conftest.py
index b06bd1c..1721f3c 100644
--- a/tests/test_client/conftest.py
+++ b/tests/test_client/conftest.py
@@ -6,6 +6,7 @@
 
 import pytest
 
+from henry.core import ClientSettings, Henry
 from hippoclient.caching import Cache
 
 
@@ -19,3 +20,10 @@ def cache(tmp_path):
 
     for id in cache.complete_id_list:
         cache._remove(id)
+
+
+@pytest.fixture
+def client(server):
+    client = Henry(settings=ClientSettings(host=server["url"], verbose=True))
+
+    yield client
diff --git a/tests/test_client/test_collection.py b/tests/test_client/test_collection.py
new file mode 100644
index 0000000..15843f2
--- /dev/null
+++ b/tests/test_client/test_collection.py
@@ -0,0 +1,53 @@
+"""
+Tests for collection uploads.
+"""
+
+from pytest import fixture
+
+from henry import Henry
+from hippoclient.collections import delete as delete_collection
+from hippoclient.product import delete as delete_product
+from hippometa import SimpleMetadata
+
+
+@fixture
+def collection_id(client: Henry):
+    collection = client.new_collection(
+        name="Test Collection A", description="A test collection for you to use!"
+    )
+
+    client.push(collection)
+
+    yield collection.collection_id
+
+    delete_collection(id=str(collection.collection_id), client=client.client)
+
+
+def test_create_collection(collection_id):
+    print(collection_id)
+
+
+def test_add_product_to_existing_collection(collection_id, client: Henry):
+    coll = client.pull_collection(
+        collection_id, realize_sources=False, pull_children=True
+    )
+
+    product = client.new_product(
+        name="Test Product",
+        description="Test product to be added as a collection member after the fact",
+        metadata=SimpleMetadata(),
+        sources={},
+    )
+
+    coll.append(product)
+    client.push(coll)
+
+    product_id = str(product.product_id)
+
+    re_read_coll = client.pull_collection(
+        collection_id, realize_sources=True, pull_children=True
+    )
+
+    assert re_read_coll.products[0].product_id == product_id
+
+    delete_product(client=client.client, id=product_id)