curl: (26) couldn't open file

I was having a similar problem after changing to PHP 5 (I was using the @ upload method and it was deprecated, so I had to start using CURLFile), and the solution to my problem was found in this stack.

Solution: curl upload won't work with relative paths, use the full path instead

Sorry guys! My bad. I had not included extension of the file in the file name. After including it, it worked. I am answering this in case someone does the same mistake in future.

For my case, using relative path didn't work. But changing it to a absolute path fixes it.

This failed

curl -i -X POST -H "Content-Type: multipart/form-data" \
    -F "file=@~/Downloads/xxx.csv" http://localhost:6708/upload

This worked

curl -i -X POST -H "Content-Type: multipart/form-data" \
    -F "file=@/Users/myself/Downloads/xxx.csv" http://localhost:6708/upload