Most of it should be from lemmynsfw.com, so that may make things simpler. From what I’ve seen, we’re usually pretty good about tagging it, especially since it’s the default when posting on lemmynsfw.com, but of course I can’t speak for other instances.
When doing this, it may be better to do [![][1]][1], then later in the post do [1]: {image url}, replacing 1 with different numbers for each image, in accordance with this
This allows people to click the image as a link and open it full-size.
Check the source of https://lemmynsfw.com/post/9361 for an example.
redgifs has image gallery uploading
I think you forgot to copy one of your links for the
[![][1]][1]example, since it shows the file link to an image from my example post.