PDF file was altered after being uploaded to Dropbox

Question

I have recently discovered that when I have uploaded a PDF to be shared with others, there are changes that occur with the PDF that are not present in the original.

For example, I noticed a strange bit of a shaded area on one page and when the printers download the file, the colour profile for the PDF is different to the original. This results in incorrect representations of the document when printed.

I tested this by uploading the exact same file to Onedrive and these changes did not occur and the file printed perfectly by the printers.

How is it possible that uploading a file to Dropbox can alter the PDF?

Extremely odd.

Jay · Answer

Thanks, keep me posted with any updates!

MartyF9 · Answer

I will need to check with the user that pointed this out.

It was not printed at the stage that the errors appeared.

I will get back to you when I get further information.

Jay · Answer

Hi @MartyF9, are the changes visible after downloading the file from the shared link, or only when viewing on the website?

Did you print the file from the site, or after downloading it to your computer?