Hi @sugar_mango,
Unfortunately, the Canvas Student App doesn't support features like MS Immersive Reader and as you guessed it, anything like this would need to be done through a browser. The iOS app does support many of Apple's accessibility features when using Canvas tools such as Pages, Modules, Assignments, etc. Two that I find particularly helpful is Text Size in iOS settings and Smart Invert to make the text easier to read without inverting items like images and videos. Also, I'm not sure of the files being used in your course, but the native iOS Office app supports immersive features. Hope some of this helps.
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