It auto-detects when you enter a link, otherwise treats text inputs as a pastebin, you can ctrl+v an image, and it has file uploads up to a few gigabytes. Code is on github (https://github.com/lgommans/dro.pm/) though I still have to change the license to be more permissive (I've decided that I won't pursue this as a commercial thing, just open a ticket if you want me to change the license sooner than whenever I work on this next). Viewing uploaded files instead of downloading is also possible for image/audio/video mime-types by adding /preview to any link.
You can also use it from the command line if you're on a keyboard+terminal-only machine, e.g. just `wget -L dro.pm/h.txt` to download the uploaded file (the links accept an arbitrary .extension) or for uploading from the command line there is a bash one-liner contained in the page source itself, see: `curl https://dro.pm | head`
Made a mistake and uploaded something private or want to edit the link? Just click delete on the website, or on the command line you can use the token that you get when creating a new link.