Scanning

Scanning to PDF and then Save as doesnt update with the dropbox file.

I launch PDF24 software. Click file, import from scanner or camera, then select my printer (TWAIN) and select output size, etc. It scans okay and I view then Save as which I usually overwrite a file of the same name and it seems to save, but I the file doesnt change in my dropbox file on my pc. If I launch the dropbox via the dropbox webpage, click on recently changed files and then open the file it is there okay??? Any suggestions??