Yes I now have lots of subfolders, but I can't sort them. I can only sort main folders. Better, but not the best, yet.

This feature appears to be implemented now, same request as here:
https://protonmail.uservoice.com/forums/284483-protonmail/suggestions/32773126-nested-folders
Use the new web UI to manage folders (different to labels, finally).
Nesting works to a depth of 3 max.

Some email clients cannot correctly handle this change so far, including the mobile app.

Dean, How did you get sub-folders to work?

Absolutely need sub folders asap. Totally dysfunctional without the sub folder feature. Should be able to create and organize them as I see fit and the ability to select and deselect them as favorites like outlook to make filing for current projects convenient. Privacy means squat if we have to live in the stone age to get it. I'll stick with Outlook and not renew proton service payments till you catch up to the 21st century

I just tried sub-folders and it worked. Is this something completely new is the past few days?

Why would you want folders when you could have labels? Network is a much better topology than a hierarchy.

Please understand how vital this is. Especially for my business account.

OMG, need subfolders, it's 2021 and I've traded usability for security.

https://protonmail.uservoice.com/forums/284483-protonmail/suggestions/43399935-proton-video-calling If you like this, You will probably like this too!

Sub-folders are essential to email management. My typical use case is incoming email is automatically sorted into top-level folders. After review/reading, they are moved to an appropriate sub-folder or permanently deleted. Thus top-level folders are "always clean" and sub-folders are always full of useful or important content.
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Edit to add: I think my use case can be accommodated by creating a "top-level" folder in which the messages carry labels indicative of their sub-category. Not ideal by any stretch, but this is a possible work-around. Now, how to import existing emails?

I just purchased a visionary account,paid my tech guy to migrate all of my accounts, change mx records, dns records etc then found out I can't nest folders! this makes my life hell right now.

The ability to embed folders, so you can put folders inside of folders. For example, have a main folder (Pharma Industry) and then be able to have folders inside of that folder for different Pharma Companies

the maintainers of this forum, if they exist, should really be making notes on ideas like this that have been implemented in beta (also people who voted on this should get their votes back since we only have ~10 votes at a time)

I like the way Gmail does the folders, which is what I believe we're talking about here. I definitely am a FOLDER user and a deciding factor in my decision to subscribe (to get the folders) instead of free. So in Gmail you can (like everyone is saying put folders inside of folders and the only way you see those folders is when you open the primary folder. Like I have a correspondence folder and I and folders inside that folder to keep all my correspondences to refer back to later. But I don't see all those correspondences till I open that primary folder called Correspondence. I'd like to see that feature in Protonmail also. I'm trying to move my folders over from Gmail now and this is one of the problems I see, good point EG.

I have the beta version 4.0 and in that version it is possible to make subfolders. Question to protonmail: when will this beta version be "the" custom protonmail version?

I agree! Why doesn't Protonmail do it ?

FYI - When using the import tool, if importing from a sub-folder, select "create new folder" and it will create the sub-folder as Main/Sub as the name, but it isnt supported in a "tree" like every other mail service in the world does. Amazing that the most fundamental folder/file path structure know to personal computing isnt incorporated

Sub-folders are indeed critical to any top-tier email system. Please add them soon.

And please fix this voting system -- it did not record my vote, and others have said the same. This raises questions about either actual skill with computer systems or basic personal integrity. The voting system looks like it must be run by Dominion Voting Systems or the Democratic National Committee!

Sub folders are critical and should be added soon. I tried to vote and it did not work.

Please create subfolders, using only labels is not the same