Hi! Thanks for reaching out. Let’s get to the bottom of your DMSS app issues. To make sure I assist you best, can you tell me a bit more?

- Are you having trouble logging in with an error message, or is the login just not responding?
- After you reinstall the app, are you sure your username and password are correct? Sometimes saved credentials might get deleted.
- For the video playback, do you get any error message, or does the video just not start at all?

In the meantime, here’s a sequence of steps you can try to resolve both the login and playback issues on your iPhone running iOS 18.6.2:

1. Verify Credentials: Double-check your username and password. If you are unsure, try resetting your password through the DMSS app or its website.
2. Reinstall with a Clean Slate: Since you already deleted the app, try rebooting your iPhone before reinstalling DMSS from the App Store. This can clear any temporary glitches.
3. Check Network Connection: Ensure your phone has a stable internet connection via Wi-Fi or cellular data. Switching networks can help verify if network is the issue.
4. Clear App Cache/Data: iOS doesn’t provide a direct cache clearing option. Deleting and reinstalling usually clears cache. If login still fails, double check that the app has necessary permissions (Settings > DMSS > Allow access to Local Network, Photos, etc.).
5. Update Firmware on NVR/Camera: Playback issues often relate to firmware mismatches on the recording device. If you can access your NVR or camera settings, try performing a cloud update or manual firmware update.
6. Login via Web or Other Device: Test logging into your DMSS account via the web or another phone/tablet - this can isolate if the problem is device or account based.

If you tried these and still cannot log in or play videos, there might be a more specific issue going on with your account or the app version. I can help guide you through some advanced settings next.

How does that sound? Let me know which steps you've already tried or any messages you see, and we’ll troubleshoot further!