diff --git a/lib/reducers/message-reducer.test.js b/lib/reducers/message-reducer.test.js
--- a/lib/reducers/message-reducer.test.js
+++ b/lib/reducers/message-reducer.test.js
@@ -198,3 +198,110 @@
     });
   });
 });
+
+describe('SET_MESSAGE_STORE_MESSAGES', () => {
+  const clientDBMessages = [
+    {
+      id: '103502',
+      local_id: null,
+      thread: '88471',
+      user: '83809',
+      type: '14',
+      future_type: null,
+      content: '[103501]',
+      time: '1658168455316',
+      media_infos: [
+        {
+          id: '103501',
+          uri: 'http://localhost/comm/upload/103501/425db25471f3acd5',
+          type: 'photo',
+          extras: '{"dimensions":{"width":1920,"height":1440},"loop":false}',
+        },
+      ],
+    },
+    {
+      id: 'local10',
+      local_id: 'local10',
+      thread: '88471',
+      user: '83809',
+      type: '14',
+      future_type: null,
+      content: '[null]',
+      time: '1658172650495',
+      media_infos: [
+        {
+          id: 'localUpload0',
+          uri:
+            'assets-library://asset/asset.heic?id=CC95F08C-88C3-4012-9D6D-64A413D254B3&ext=heic',
+          type: 'photo',
+          extras:
+            '{"dimensions":{"height":3024,"width":4032},"loop":false,"local_media_selection":{"step":"photo_library","dimensions":{"height":3024,"width":4032},"uri":"assets-library://asset/asset.heic?id=CC95F08C-88C3-4012-9D6D-64A413D254B3&ext=heic","filename":"IMG_0006.HEIC","mediaNativeID":"CC95F08C-88C3-4012-9D6D-64A413D254B3/L0/001","selectTime":1658172650370,"sendTime":1658172650370,"retries":0}}',
+        },
+      ],
+    },
+    {
+      id: 'local11',
+      local_id: 'local11',
+      thread: '88471',
+      user: '83809',
+      type: '14',
+      future_type: null,
+      content: '[null,null]',
+      time: '1658172656976',
+      media_infos: [
+        {
+          id: 'localUpload2',
+          uri:
+            'assets-library://asset/asset.heic?id=CC95F08C-88C3-4012-9D6D-64A413D254B3&ext=heic',
+          type: 'photo',
+          extras:
+            '{"dimensions":{"height":3024,"width":4032},"loop":false,"local_media_selection":{"step":"photo_library","dimensions":{"height":3024,"width":4032},"uri":"assets-library://asset/asset.heic?id=CC95F08C-88C3-4012-9D6D-64A413D254B3&ext=heic","filename":"IMG_0006.HEIC","mediaNativeID":"CC95F08C-88C3-4012-9D6D-64A413D254B3/L0/001","selectTime":1658172656826,"sendTime":1658172656826,"retries":0}}',
+        },
+        {
+          id: 'localUpload4',
+          uri:
+            'assets-library://asset/asset.jpg?id=ED7AC36B-A150-4C38-BB8C-B6D696F4F2ED&ext=jpg',
+          type: 'photo',
+          extras:
+            '{"dimensions":{"height":2002,"width":3000},"loop":false,"local_media_selection":{"step":"photo_library","dimensions":{"height":2002,"width":3000},"uri":"assets-library://asset/asset.jpg?id=ED7AC36B-A150-4C38-BB8C-B6D696F4F2ED&ext=jpg","filename":"IMG_0005.JPG","mediaNativeID":"ED7AC36B-A150-4C38-BB8C-B6D696F4F2ED/L0/001","selectTime":1658172656826,"sendTime":1658172656826,"retries":0}}',
+        },
+      ],
+    },
+  ];
+
+  const threads = {
+    '88471': {
+      messageIDs: ['local11', 'local10', '103502'],
+      startReached: false,
+      lastNavigatedTo: 1658172614602,
+      lastPruned: 1658169913623,
+    },
+  };
+
+  const { messageStore: updatedMessageStore } = reduceMessageStore(
+    {
+      messages: {},
+      threads,
+      local: {},
+      currentAsOf: 1234567890123,
+    },
+    {
+      type: 'SET_MESSAGE_STORE_MESSAGES',
+      payload: clientDBMessages,
+    },
+    {},
+  );
+  test('removes local media when constructing messageStore.messages', () => {
+    expect(updatedMessageStore.messages).toHaveProperty('103502');
+    expect(updatedMessageStore.messages).not.toHaveProperty('local10');
+    expect(updatedMessageStore.messages).not.toHaveProperty('local11');
+  });
+
+  test('removes local media when constructing messageStore.threads', () => {
+    expect(updatedMessageStore).toBeDefined();
+    expect(updatedMessageStore.threads).toBeDefined();
+    expect(updatedMessageStore.threads['88471']).toBeDefined();
+    expect(updatedMessageStore.threads['88471'].messageIDs).toBeDefined();
+    expect(updatedMessageStore.threads['88471'].messageIDs).toEqual(['103502']);
+  });
+});