I uploaded IPA to itunesconnect as a new app today and got email from Apple.
We identified one or more issues with a recent delivery for your app, "xxxxxx" 1.0 (2020.1.251654). Your delivery was successful, but you may wish to correct the following issues in your next delivery:
ITMS-90809: Deprecated API Usage - Apple will stop accepting submissions of apps that use UIWebView APIs . See https://developer.apple.com/documentation/uikit/uiwebview for more information.
After you’ve corrected the issues, you can upload a new binary to App Store Connect.
The App Store Team
I remember, during updating of existing apps, I never see this type of email. Is there anything I need to worry about?