Not sure as I use Toby Kurien’s WebApps for stuff like that. Only using Native Alpha Plus for old email accounts (Netscape/AOL, Yahoo, etc.).
Checked their GitHub and see that crashes have been reported when long-pressing.
Have you tried the right-click menu thing? See this post… https://github.com/cylonid/NativeAlphaForAndroid/issues/119#issuecomment-2284133665
…from the following thread… Clipboard contents not available · Issue #119 · cylonid/NativeAlphaForAndroid · GitHub
Ah, sorry. Forgot to include a link. Just noticed today that it is no longer on F-Droid.
WebApps is no longer maintained but so is the dev’s older GApps Browser yet that’s still there. Strange.
Despite being dated it suits me fine. Used with updated webviews (Mulch) so I feel comfortable with its use.
GitHub - tobykurien/WebApps: DEPRECATED ⛔️ Android app to provide sandboxed (private) browsing of webapps