While the FAQs here are excellent, with my level of security protections and my browser what I see in the pictures and what I see on my screen are different.
Some people send pictures to themselves and can get them loaded that way.
I have to reduce the file size of my pictures and I use this free, limited but easy, and most importantly does not set of my virus scanners.
https://www.reduceimages.com/
Once you have downloaded the image, you can easily upload it back on site.