I am a full time Mlem user, absolutely love the app. I am not looking to replace it, however there is currently no development for being able to manage your media within the app.
I would also like to find an app that can save posts and comments as drafts. This is not a deal breaker however and would only be looking at that if it has media management.
Through the web interface there is an upload tab which shows all of the media you have uploaded. You can delete files, or copy the link to an image so you can share and not have to upload a repeat image.