I wasn't referring to the file type of thumbnails. When I worked on this code, we discussed the fact that the stored thumbnail locations (from before this code merges to master) would be different from the new thumbnail locations. Therefore we wanted to use the new locations going forward, and just use the fact of whether or not a location had been previously stored as a boolean for whether or not this file has a thumbnail version.

After I did that work, I think you and Nimisha may have further refined the code. I just don't understand the changes you guys made (that @nasthagiri references at the beginning of this thread) and was hoping for an explanation.