Hi @jaclmoore, welcome to our Community!
If I understand the issue correctly, it sounds like you're getting an error, when trying to preview a file that you downloaded from your Dropbox account, is that correct?
Feel free to clarify if I got it wrong.
Would you mind sending me a screenshot of the message you mentioned above?
Also, does this happen with one specific file, or multiple ones?
Let me know more, and we'll take it from there!