I support this emphatically!

At the very least, we need to be able to pick which e-mail alias owns individual folders, if not individual files.

Proton Team, please consider:

1. For most of us, our Proton Drive was created under our primary username, and MANY of us follow the practice of not revealing that username to anyone. This puts us between a rock and a hard place when wanting to share things from Drive.

2. The whole point of multiple e-mail aliases is to separate different aspects of your life. If you're sharing something with a business colleague, you might not want him to know your personal alias, or vice-versa. And for the other guy, seeing files shared by an e-mail address that he's never seen before is confusing.

Number 2 is the reason why a request to Support to wipe your Drive and re-create it using a different alias doesn't actually solve the problem. It still boils down to one particular e-mail address that has to be revealed to absolutely everyone you share anything with, even if that isn't the one that you want them to know or use!

The e-mail address is also revealed when writing a comment into a document when logged in. Then, anyone with the link can see it together with the comment. This is not good at all. It should be made optional. As a privacy provider, Proton should think through carefully how it sets these things up beforehand.

This is a critical feature for anyone that uses one or more custom domains. Let us choose which email alias to use when sharing OR use the default email alias. Either or will work.

I didn't even know it displayed the main email address... that's actually a complete no-go and should be standard. It must be a joke that Proton implements something like that without thinking it through.

This is the reason I don't use Proton Drive. A common approach to privacy is persona's and email aliases enable that to occur. As stated in the previous comment, protecting the primary account email address is important to me, I don't want to share it - ever.

Enable a folder to be assigned a Proton email alias or Proton Pass alias and all files under that folder are displayed as owned by that alias as well as the email from which it is shared.

This would enable a user to establish a persona within proton to share emails and documents.

It feels defeating to work on keeping my actual Proton email out of the clutches of Big Tech by never sending emails from it, never registering for services with it, etc., only to have it revealed when I want to share a file or folder with a friend/family member who uses Gmail.

When sharing a photo from Proton Drive on my mobile phone via a public link, the recipient receives a request on behalf of my main account.
Since I do not share this account with anyone, it is not immediately clear to the recipient who this request is from, and I find it undesirable for this account to become known.

Please make it possible to choose an alias or even make it standard practice to use the primary alias for this purpose.