I uploaded two PDF files to the library, however, the file preview is blank and when I place the link in my survey I get an error:
oks like you bumped into an error.
This is most commonly caused by a session timeout, but we logged the error (just to double check).
Account type is Basic.
I got the attachments to open in the survey – the http:/ was missing from the embed code when I copied it yesterday. It was there this morning. I don’t know why the preview (in the files library) is blank, but at least I got it working in my survey.