When attaching a picture to your post it is advisable to use this function as that would show your picture directly in the post instead of as an attached file.
There are organizations that have policies that forbid employees to open files on certain file sharing sites. Me for example cannot open an attached file in the community directly as it is stored on Box, but I can download the file and then open it. As this is quite cumbersome it is much better if you where to use the appropriate function for adding pictures to a post.
I have no idea on this as I've never worked with MTR devices. From what I've heard from Cisco it should however support Webex same as a device running RoomOS in native mode. Do you not have the specific Webex join button visible on the touch panel?
