So why are these items getting skipped? Not uploading the files, and uploading everything else works like a charm, but trying to import the files as well leads to all of them getting skipped.
If so, there are a couple of things that could be happening if it’s still not imported the images. You might need to check logs or just simply try manually adding an item with media.
Did you try manually adding the item and uploading the item? I’m wondering if you ImageMagick installed and configured properly in your settings. I feel like this could prevent your images from being imported. If that’s working outside of the CSV import, I wonder if your server might have disabled PHP functions or network calls for retrieving remote URL’s.
The most common situation here that’s going to cause skipping is if the URL can’t be loaded. You’ve shared an example URL, but sharing the CSV, or a pared down version of it (even a single row) might be the best way to confirm or narrow down the problem, if the problem lies in the CSV.
In terms of seeing what’s going on yourself in more detail, if you have error logging turned on (see the “Activate Error Logging” section of that link) then CSV Import should log a message when it skips a row and indicate why.