It's similar to this one: https://forums.openlp.org/discussion/996/powerpoint-on-reload
But for me it's images instead of PowerPoint, I tried both png and jpeg, but no lock yet.
Thank you for such great software, I tried it today and finished the service smoothly. However there's a little bug, I already emailed to report it.
**OpenLP Bug Report**
Version: {'full': '2.9.4.277-2464d8303', 'version': '2.9.4.277-2464d8303', '…