Missing backslash?

I created 1 folder and started adding media, and everything was working fine. Then I added a second folder, and suddenly nothing was working. All the previous images were broken links and anything I added to my new folder broke. Looking through ftp, the images are in the correct folder. But when I examine the URL, it is missing a slash. “https://domain-name/wp-content/uploads2016/pics/2016.jpg” There needs to be a slash between uploads and 2016. I’ve double checked and I’ve specified the correct URL. After playing around with it, I can sometimes get it to display the image again (even though the URL is still missing a slash.) Any idea what would be causing this or how to fix it?

This plugin was exactly what I was looking for, but I can’t use it if it won’t be dependable. Thanks for your help!