In progress :)
It's best to turn the 'auto-fit message' setting off on the Android app. If you leave it on (not recommended) it has the unfortunate side effect of adding hard line breaks to outgoing messages which makes them a little difficult to read. The setting can be found as pictured below. In the app Settings → General Settings
To trim the post on a phone push on the ellipsis (…) to bring up the option to delete the quoted text.
On the web version use the down arrow until the ellipsis (…) becomes highlighted and then backspace to delete it.
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