Earlier today, I made a mistake and accidentally deleted a significant amount of work on one of my workbooks. I duplicated the app I was using and incorrectly assumed this would duplicate the workbook as well. Then, I deleted much of the data in the workbook to clear up space for my new project, not realizing this would remove the data from the workbook in use with my previous app since both apps pull from the same workbook.
When I realized what I had done, I attempted to recover a previous version of my workbook using the recover snapshots feature. However, I got a message saying "Workbooks are saved hourly, so there aren’t any earlier versions to recover." This workbook has existed for almost a year and I've spent dozens of hours on it, so I'm wondering why it says there aren't any versions to recover.
I will note that I did almost all of the work on that workbook from a "contributor" access, not as an owner. However, I had the owner check and see if he could use the recover feature, and he got the same error message. The owner then made me the workbook's owner, but I still got the error message.
Is there any way for me to recover a previous version of the workbook? I lost a non-trivial amount of data and dozens of hours of work, so I am very interested in recovering this data if at all possible.