Fix uploading Tempfiles to Azure Storage

Closes #32530.

activestorage/lib/active_storage/service/azure_storage_service.rb

@@ -20,7 +20,7 @@ def initialize(storage_account_name:, storage_access_key:, container:)
     def upload(key, io, checksum: nil)
       instrument :upload, key: key, checksum: checksum do
         begin
-          blobs.create_block_blob(container, key, io, content_md5: checksum)
+          blobs.create_block_blob(container, key, IO.try_convert(io) || io, content_md5: checksum)
         rescue Azure::Core::Http::HTTPError
           raise ActiveStorage::IntegrityError
         end

activestorage/test/service/azure_storage_service_test.rb

@@ -16,6 +16,23 @@ class ActiveStorage::Service::AzureStorageServiceTest < ActiveSupport::TestCase
       assert_match(/(\S+)&rscd=inline%3B\+filename%3D%22avatar\.png%22%3B\+filename\*%3DUTF-8%27%27avatar\.png&rsct=image%2Fpng/, url)
       assert_match SERVICE_CONFIGURATIONS[:azure][:container], url
     end
+
+    test "uploading a tempfile" do
+      begin
+        key  = SecureRandom.base58(24)
+        data = "Something else entirely!"
+
+        Tempfile.open do |file|
+          file.write(data)
+          file.rewind
+          @service.upload(key, file)
+        end
+
+        assert_equal data, @service.download(key)
+      ensure
+        @service.delete(key)
+      end
+    end
   end
 else
   puts "Skipping Azure Storage Service tests because no Azure configuration was supplied"