Samsung S9 - Heimdall detecting fail

/e/OS Devices Samsung
,
8

→ Install /e/ on a Samsung Galaxy S9 - “starlte”

  1. On the device, go into Advanced > ADB Sideload, then swipe to begin sideload

In TWRP Recovery this command is provided.

https://ecloud.global/s/ec97JgKex55cJdX

→ What is ADB Sideload and how can I use it?