When you upload or drag'n'drop an image to mattermost, that image gains a new name that does not end with an image extension, thus if you try to "copy image location" or use the "copy public link" from mattermost their will give u a link that you can paste back to matter most to re-link the image in a preview mode.

A copy public link will look like:

https://pre-release.mattermost.com/api/v3/public/files/zkqjspdektrqjde9xqnp7ef1er/get?h=gCgcKHjPrBr1OihNm-Iplg6-3uguwbWNDIMSev4GGuA

And copy image location will look like:

https://pre-release.mattermost.com/api/v3/files/zkqjspdektrqjde9xqnp7ef1er/get_preview

As you can see neither end with a image extension and so if I simple paste it back in a message it will not come out as an image preview.

What I am suggesting here, is that mattermost either understand it's own links to be able to properly re-link a image or file as posted again or converts the link of images to have an extension so we can link it back without much hassle.

Thanks.