Yes, this is checked already.
Furthermore I found out that in some messages, the link doesn’t target the dropbox files either, and there is no file path, just the filename. For example (again leaving some blanks in the html tags below):
< a href=”id.pdf”>id.pdf
This is rare, it happens approximately twice every 20 instances.
I have selected to store files only on dropbox.
I will try regenerating the token in dropbox.
Thanks again for your time and effort