iPad Won’t Stop Copying Files to Dropbox

Downloaded 2 files to my iPad from the internet.

Then tried to copy them to Dropbox.

Did not seem to work at first glance. (Bad internet connection?) So I kept trying to do it, in frustration.

Days after, I found the files were successfully copied to Dropbox. Over and over. Almost every day, it seemed that new copies of the files kept getting uploaded, even after I deleted the original files from my iPad.

Anyone know what happened here? And, more importantly, how do I stop it?

Thank you in advance;