Sorry for being late, but I did get a way to make it work!
Basically, you Create a regular tweet with the Twitter API 2.0 Auth, but you can create a reply to it - but only through the older API connection.
- Create an API call through the original Twitter API. Note, that this seems confusing to make both connections through the website. To make both, you need to make separate connections via different 1.0 and 2.0 calls.
- Then make an API call.
- Then you can use the body:
{“text”: “{{InsetTextHere}}”,“reply”:{“in_reply_to_tweet_id”:“{{TweetIDFrom2.0CreateATweet}}”}}
I was told how to also include images, but I was honestly unable to get it work.