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Then go to the bookmarks and long press on the one you just made. Do so or not, your choice, but if you choose not to, you'll need to enter the information every time you go there, obviously. You'll be asked if you want the browser to store these data.
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Now, to make your native "app": Navigate, using the stock browser, to /inbox to get to the login screen. (ProtonMail seems to think it's okay, because its Android and IOS apps store those data, too.) You can instruct the browser to save your username and password, if you don't mind the risk. The ProtonMail webmail page displays nicely in the browser. It's found in the much-reviled SFOS browser. If only there were a native SFOS ProtonMail app. Sometimes the Android app simply wouldn't update, causing missed email. I spent a lot of time in an unsuccessful effort to get notifications to work.
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The app was all the time saying that it wouldn't work without Google Play Services or whatever they're called (though it did work, at least to some extent). There isn't.), so I paid the money and got the commercial Sailfish X, then installed fdroid and the Yalp store, then the ProtonMail Android app. Still, I needed email on my phone (in fact, I'd still be on my Blackberry Q10 if there were a way to access ProtonMail on it. To me this was an uncomfortable choice, because for anyone interested in security or privacy, anything Android is not wanted. ProtonMail does provide its own home-made client apps for IOS and Googledroid, and the latter can be used on Sailfish via aliendalvik. Unfortunately, the encryption, ports, and protocols employed by ProtonMail prevent it being just popped in to any old email client, such as the native SFOS one. It was this concern, too, that led me to ProtonMail, the secure Swiss-based email provider. Even local ISPs are getting into the act, harvesting email, browsing, and other online activities for whatever they can sell. With iThings we're at the mercy of Apple, and Googledroid is a public bazaar of our information. Like I suppose at least some others, I adopted SFOS because with it there's some hope of security and privacy.
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