Lockdown Browser?

Will the lockdown browser enable me to log into the test on my phone, too? I’m taking my AP tests on my laptop, but for Physics (and sometimes, Bio), I hand draw the graphs and write out answers and I upload the pictures by logging into CB on my phone. Will we be using the lockdown browser? In the demo, they pulled up a text file in a separate window, which I don’t think can happen with the browser.

I don’t think there is a requirement to use a lockdown browser.