Hi @GemaRuber,
Unfortunately, I don't know of a way to automatically take a powerpoint and convert it into a series of pages. In general, powerpoint slides are formatted to fill a scree (16x9 aspect ratio), but Canvas pages (as with most web platforms) are more of a dynamic format that changes as users resize their browsers, and varies based on the device they are using as well. I would perhaps suggest trying to copy/paste from a powerpoint slide into a page to see how it looks. Sometimes is may come out relatively well, but other times it could be a disaster, just depending on the complexity of the slide. It's not ideal, but copy./pasting slide by slide and then fixing the formatting so it looks nice on a page may be the best way to go.
I also looked up EdApp, as I'm not familiar with that platform. It appears EdApp is another LMS, and doesn't really connect to Canvas. If EdApp happens to export content in the imscc (common cartridge) format, you could export from there and then import that package into Canvas relatively seamlessly. I wish I was more familiar with EdApp to let you know for sure if this is possible, but I'm hoping the suggestion might help you investigate.
Hope this helps a bit, even if it's not the scenario you may have been hoping for.
-Chris