Finally got access, now I have questions!

Hey, Beepers!

I finally got access to the app this morning after waiting just about two years and I have been tinkering with the features a ton. iMessage worked great as well as Discord and Instagram.

My questions are fairly simple for anyone has been using the service for a bit.

1.) Is archiving the only option to remove unwanted messages? I started a thread with a duplicate contact by accident and I don't see an option to remove it.

2.) Will iMessages sync if I continue to use the iMessage app on my iPhone instead of the Beeper app, then continue using the Beeper app on Desktop?

3.) Is there a way to upload my iPhone contacts to Google to allow them to be shown in the app? I did see contact syncing with Apple may be coming but at the moment I am adding everything manually.

4.) Any tips of functions I should know? Anything to avoid?