I have installed the Canvas Teacher app on my Kindle Fire. I like to use it primarily to grade student submissions to the Canvas page. In a web browser on my Kindle Fire, I can do this well enough. I use my fingers to widen the view of the file to (almost) the entire 10" display on the Kindle Fire tablet. But when I view the same file not via a web browser, but through the Canvas Teacher app, the student submission is rather small, and does not get expanded however much I try to widen it with my fingers.

Is this simply not a function of the teacher app? Or is there a way to view student work, that I haven't figured out yet?  The browser (Edge browser) seems rather slow, and viewing many documents like this reminds me of how slow browsing was back in the days of Windows 98. If I can get a dedicated app to do this for me I would love to try it out.