Hi there! I understand you're experiencing some trouble with the Substack app crashing on your iPhone 8. That sounds inconvenient! Let's see if we can get this sorted out.

First, could you tell me if you've already tried any troubleshooting steps, such as restarting your iPhone or reinstalling the app? This will help me guide you more effectively.

Yes, I have deleted and re-installed the app and I have restarted the phone.

Thank you for sharing that you've already deleted and reinstalled the app, as well as restarted your iPhone. Let's dig a little deeper to find a solution.

1. Check for Updates: First, make sure that both your iOS and the Substack app are updated to the latest versions. Sometimes, bugs are fixed in new updates.

- To check for an iOS update, go to Settings > General > Software Update.
- To check for a Substack app update, open the App Store, tap on your profile icon at the top right, and scroll down to see if Substack has an update available.

2. Free Up Space: Check if your device has enough storage space. If your iPhone is running low on storage, it may cause apps to behave unexpectedly. You can check this under Settings > General > iPhone Storage.

3. Force Close the App: Sometimes, force closing the app can help reset it. To do this, swipe up from the bottom of the screen and pause slightly in the middle of the screen to bring up the app switcher. Swipe left or right to find the Substack app and swipe it up to close it.

4. Reset Network Settings: Since some app functionalities rely on a stable connection, you could try resetting your network settings. This will not erase your data, but you'll need to reconnect to Wi-Fi networks afterward.

- Go to Settings > General > Reset > Reset Network Settings. You’ll need to enter your passcode to confirm.

5. Contact Substack Support: If the issue continues, it might be worth reaching out to Substack support for a potential bug report or further assistance. You can reach them via email at [email protected].

Please give those steps a try and let me know how it goes! Are you satisfied with the solution I provided, or do you need assistance with anything else?