Attachment preview too large, while the height of edit frame is too small

Hello Keelung, 

  I have experienced the same formatting when inserting various file types into the E2E post.  One solution is after the file has been inserted and the large image appears, right-click on the image, then click the "Show Link Only"  

I did that with the "too large" image you posted in your first post, the result shown here:

/cfs-file/__key/communityserver-discussions-components-files/1024/preview_5F00_too_5F00_large.log

Please give that a try and let us know your success with this technique. 

At your service, 

~Leonard