Hello, Steemauto users.
According to your requests, I added a simple post preview to scheduling posts page.
You can write your posts in markdown (and some html tags supported)
Note: still you can write your posts in steemit.com and then copy to steemauto.com
Note: Read more about markdown codes here
I used an open source library (remarkable) beside angularjs, highightjs and some javascript codes for building this preview.
and first image modified by 
Regards,
Steem witness,
2018-02-25