Is there any way of getting the raw image file and not the editable version. And not a downloadable file, a linkable.
Collabshot was intended as an internal tool at Toptal, even tho it's available for public now, it's still run on one server only and making it image hosting would put a lot of strain on said server and would worsen experience for users who actually need screenshot annotating functionality.
I suggest you to try imgur.com or minus.com, they're free and proven to handle any amount of trafic. You can save screenshot to your local directory with Ctrl+Alt+L shortcut via collabshot app.
Customer support service by UserEcho