Cloudinary Image Asset Upload Doesn’t Work
At first I tried to upload an image without realizing that Cloudinary was required for that functionality, so naturally it didn’t work. (I realize the documentation is a WIP, but I think it would be helpful to at least add a heads up about this.) Console showed the warning No "CLOUDINARY_URL" set, followed by a 400 Bad Request of {"error":{"message":"Upload preset not found"}}
So I signed up and added my CLOUDINARY_URL to the .env. The warning went away but upon uploading I got the same “Upload preset not found”. I then enabled unsigned uploading in Cloudinary but it made no difference.
You need to add an upload preset on cloudinary, with the name prime-asset. Here's a link with a tutorial on how to do that in cloudinary.
Here is a video guide: https://www.youtube.com/watch?v=E_fvJzDNloc