If you want to make my life easy just post the gif's URL as plain text and make sure it ends with ".gif". If it doesn't, it won't work - except for gfycat links but make sure these are not too long (<10s) because longer ones get heavily compressed.
If you want to add a bit of text you can use " å " as a delimiter after the URL e.g.: "https://media.tenor.com/fdcEgC7_DywAAAAd/big-sexy.gif å Spikednation Moderator Meetup".
Thanks for the help!