Is it there a way to selectively upload only new items?

I have created new contents today, in the same conditions I used to have this problem and everything seems to be running fast and smooth this time.

You can see my blog at https://nuvogue-electronics.com.mx/blog/

So we can say the solution was to add the slash at the end of the public_html/blog/ as kosi77 suggested.

Thank you very much. This topic has been solved with your help.

Appreciation.

Regards.