Greetings EdCV,
If you are having issues with third-party apps, these are the best steps to take:
"1. Close and reopen the app
Force the app to close. Then open the app to see if it works as expected.
2. Restart your device
Restart your iPhone or restart your iPad. Then open the app to see if it works as expected.
3. Check for updates
To see if updates are available for the app, open the App Store, tap your profile icon, then scroll down to see if updates are available. If updates aren't available for the app, update the software on your iPhone or iPad.
4. Delete the app, then redownload it
Delete the app. When you do this, you might lose data that was stored in the app. Then redownload the app. Then check to see if the problem with the app is fixed." If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open
If the issue continues, it's best to contact the app developer for support. They will be in the best position to support you: How to contact an app developer
We hope this helps!
Sincerely.