[Would like to recover my art work, pretty much start this day over.]

I opened a file that contained two art boards. I clicked on a layer on the second art board and choose to edit the item in Affinity Publisher. Focusing on Publisher, I closed Designer and saved the work completed.

I can see the layers I created on the second art board and, strangely, the very last layer I worked on on the 1st art board, but lost 50 other images from the 1st art board.

How can I get these images back. Disclaimer, I did NOT use Time Machine nor did I save the file with document history. I know... Is there anyway I can reset the application to look and appear the way it did with the exact layers etc that I had yesterday?