Thanks for reaching out! If you delete a doc it should remain in your trash for 7 days. If you think deleted it within the past 7 days, it may be hiding somewhere else in your account, or there may be something else going on. I am happy to help you search for your file, but can you first follow a few simple steps for me?
1. The document might be there now, but for some reason didn't show up when you last looked. Can you double check to ensure the document is not there?
2. You may have logged into the wrong account, possibly by using single sign on while signed into a different email account. I suggest that you make sure you've checked any and all Lucidchart accounts that might be under your email address(es).
3. Your document 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. Simply click on the name of the document in your history and it should be restored to your account.
If none of these options work, can you please fill out a contact support form, and include any information you have about the document in question?
Thanks in advance!