Hi Cathy, happy to help! Here are a few things you can do:
Check Your Account:
The document(s) may still be there. Have you double checked that you're in the correct account? Sometimes users will use single sign on while signed into a different email account, which can produce errors. We suggest that you make sure you've checked any and all Lucidchart accounts that might be under your email address(es).
Check Your Trash:
It is easy to accidentally delete documents. Please check that the documents aren’t in your trash. You can access your trash at the bottom of your folder manager found on the documents page.
If the documents were shared with you and now you no longer see them in your account, it is possible that whoever shared it with you rescinded your access. We recommend reaching out to the document owner to have them re-share it with you.
Check Browser History:
Your documents might be hiding in your browser history. If you carefully look through your browser history when you last worked on the document, you might be able to find it.
If none of these options work, please comment below with the document name or URL and any email addresses you may have used to sign up with. We may be able to locate the document that way. Feel free to also contact support here if you do not want to share this information publicly.