1. I can't write an email from an alias. For example I can't send an email from [email protected]. This is possible from Thunderbird using their bridge, but not from their email app on Android. I can reply to an email and it will preserve the alias, but I can't write one from scratch.
2. Emails are not downloaded locally on Android so I can't access them when internet is not available.
These 2 have been consistent issues for me over the 3 years I've used them, and when I've contacted their customer support about it I was told they have no intention of fixing them.
I use Proton on Android and I can write a new email using one of my aliases. Maybe it was fixed recently.
Regarding n° 2, I think it will never be fixed, given the nature of the service itself, in which all emails are stored encrypted, and the encryption keys are in the server.
2. Emails are not downloaded locally on Android so I can't access them when internet is not available.
These 2 have been consistent issues for me over the 3 years I've used them, and when I've contacted their customer support about it I was told they have no intention of fixing them.