diff --git a/app/controllers/active_storage_db/files_controller.rb b/app/controllers/active_storage_db/files_controller.rb
index a2635d9..65802ba 100644
--- a/app/controllers/active_storage_db/files_controller.rb
+++ b/app/controllers/active_storage_db/files_controller.rb
@@ -28,7 +28,7 @@ def update
     private
 
     def acceptable_content?(token)
-      token[:content_type] == request.content_mime_type &&
+      token[:content_type] == request.media_type &&
         token[:content_length] == request.content_length
     end
 
diff --git a/lib/active_storage/service/db_service.rb b/lib/active_storage/service/db_service.rb
index 2e947fc..831265a 100644
--- a/lib/active_storage/service/db_service.rb
+++ b/lib/active_storage/service/db_service.rb
@@ -27,9 +27,12 @@ def initialize(public: false, **)
 
     def upload(key, io, checksum: nil, **)
       instrument :upload, key: key, checksum: checksum do
-        file = ::ActiveStorageDB::File.create!(ref: key, data: io.read)
-        ensure_integrity_of(key, checksum) if checksum
-        file
+        data = io.read
+        if checksum
+          digest = Digest::MD5.base64digest(data)
+          raise ActiveStorage::IntegrityError unless digest == checksum
+        end
+        ::ActiveStorageDB::File.create!(ref: key, data: data)
       end
     end
 
@@ -111,7 +114,7 @@ def headers_for_direct_upload(_key, content_type:, **)
     private
 
     def service_name_for_token
-      respond_to?(:name) ? name : "db"
+      name.presence || "db"
     end
 
     def adapter_sqlite?
@@ -159,16 +162,6 @@ def generate_url(key, expires_in:, filename:, content_type:, disposition:)
       )
     end
 
-    def ensure_integrity_of(key, checksum)
-      record = object_for(key)
-      raise ActiveStorage::FileNotFoundError unless record
-
-      return if Digest::MD5.base64digest(record.data) == checksum
-
-      delete(key)
-      raise ActiveStorage::IntegrityError
-    end
-
     def retrieve_file(key)
       file = object_for(key)
       raise ActiveStorage::FileNotFoundError unless file
@@ -184,14 +177,23 @@ def object_for(key, fields: nil)
     end
 
     def stream(key)
-      data_size = adapter_sqlserver? ? "DATALENGTH(data)" : "OCTET_LENGTH(data)"
-      size = object_for(key, fields: "#{data_size} AS size")&.size || raise(ActiveStorage::FileNotFoundError)
+      size = object_for(key, fields: data_size)&.size || raise(ActiveStorage::FileNotFoundError)
       (size / @chunk_size.to_f).ceil.times.each do |i|
         range = (i * @chunk_size)..(((i + 1) * @chunk_size) - 1)
         yield download_chunk(key, range)
       end
     end
 
+    def data_size
+      if adapter_sqlserver?
+        "DATALENGTH(data) AS size"
+      elsif adapter_sqlite?
+        "LENGTH(data) AS size"
+      else
+        "OCTET_LENGTH(data) AS size"
+      end
+    end
+
     def url_helpers
       @url_helpers ||= ::ActiveStorageDB::Engine.routes.url_helpers
     end
diff --git a/spec/requests/file_controller_spec.rb b/spec/requests/file_controller_spec.rb
index 0f4ff8a..9cedb25 100644
--- a/spec/requests/file_controller_spec.rb
+++ b/spec/requests/file_controller_spec.rb
@@ -143,18 +143,13 @@ def unprocessable
     end
 
     context "when the integrity check fails" do
-      let(:invalid_file) { create(:active_storage_db_file, data: "Some other data") }
+      it "fails to upload and does not persist the file", :aggregate_failures do
+        allow(blob.service).to receive(:upload).and_raise(ActiveStorage::IntegrityError)
 
-      before do
-        annotated_scope = ActiveStorageDB::File.annotate("DBService#object_for")
-        allow(ActiveStorageDB::File).to receive(:annotate).and_return(annotated_scope)
-        allow(annotated_scope).to receive(:find_by).and_return(invalid_file)
-      end
-
-      it "fails to upload" do
         put blob.service_url_for_direct_upload, params: data, headers: { "Content-Type" => "text/plain" }
 
         expect(response).to have_http_status(unprocessable)
+        expect(blob.service).not_to exist(blob.key)
       end
     end
   end
diff --git a/spec/service/active_storage/service/db_service_spec.rb b/spec/service/active_storage/service/db_service_spec.rb
index 25aa50a..91765eb 100644
--- a/spec/service/active_storage/service/db_service_spec.rb
+++ b/spec/service/active_storage/service/db_service_spec.rb
@@ -247,6 +247,10 @@
       it "fails to upload the data" do
         expect { upload }.to raise_exception ActiveStorage::IntegrityError
       end
+
+      it "does not persist the file" do
+        expect { upload rescue nil }.not_to change(ActiveStorageDB::File, :count) # rubocop:disable Style/RescueModifier
+      end
     end
 
     context "with a duplicate key" do
@@ -300,20 +304,15 @@
     end
   end
 
-  describe ".ensure_integrity_of" do
-    before { upload }
-
-    after { service.delete(key) rescue nil } # rubocop:disable Style/RescueModifier
-
-    context "when the record is missing during integrity check" do
-      it "raises FileNotFoundError" do
-        # Simulate the record disappearing between upload and integrity check
-        allow(service).to receive(:object_for).with(key).and_return(nil)
+  describe "service_name_for_token" do
+    it "returns the service name when set" do
+      service.name = "custom_db"
+      expect(service.send(:service_name_for_token)).to eq("custom_db")
+    end
 
-        expect {
-          service.send(:ensure_integrity_of, key, "bad_checksum")
-        }.to raise_exception(ActiveStorage::FileNotFoundError)
-      end
+    it "falls back to 'db' when name is nil" do
+      service.name = nil
+      expect(service.send(:service_name_for_token)).to eq("db")
     end
   end