Files stays for 48 hours if the server isn't overloaded, server currently does NOT accept file >70MB I strongly advise to encrypt your files before uploading, for client side encryption you can use this privnote (which obviously requires Javascript)
You can also use curl to upload from the terminal like so :
curl -X POST \ -F "file=@epic_image.jpg" \ -F "strip_metadata=1" \ -H "Accept: application/json" \ https://exitprocess0.net/upload.php