Downloaded the Perfect Viewer app yesterday to read the many cbr format comics I have on my tablet. It simply doesn't work- even finding my comic books through this app is a major task.. Shouldn't that happen automatically? So after half an hour I manage to find a way to locate the comics.. So how do you open them? Again, there's no clue. I click on a comic, and all that comes up is a message saying 'file not found' - what does this mean? I thought maybe there's a problem with my comic books themselves, but I checked & can open them instantly using other comic book readers with no problem. Maybe there's some way to set up the Perfect Viewer app - but there's no information in the app itself about this. Google search provides no answers either. But in any case, why should an app user have to waste time setting up a basic function? A comic book readers which won't allow you to read comics is a comic book readers which has failed. An app which doesn't work out of the box is an app that doesn't work, period. Can't understand why something so badly designed has been out out three-year this is 2020, not 1990.