You tacked on your comment to a six-year old thread. The overlay issue that you experienced may be due to a different cause entirely.
Overlays not displaying in export may result from editing errors or, especially with complex projects, memory limitations. How a project is built is key.
Please be specific on what you see and did. Better still, take a minute to share a project that has the issue so others can attempt to track it down.
The process is easy, quick and can be private. Just follow these steps...
Back up --- With your project on the timeline, click on MENU at the top-left. Click FILE|BACK UP PROJECT FILES TO FOLDER. Choose a folder and SELECT FOLDER.
Upload --- Upload the saved, numbered FOLDER. Use a free server - Google Drive, MS OneDrive, etc.* Do NOT upload the individual VPJ or export file.
Get link --- Get a public link. If using Google Drive click GET SHAREABLE LINK. Change "restricted" to "anyone with the link can view" Click COPY LINK | DONE.
Share --- Paste that link here, or click the folder at the top-right of this forum to message it privately to me. It won't be shared.
* Before uploading, right-click the folder, click PROPERTIES. Look at the File Size to confirm that it's not too big for the free space on the server.