After updating RouterOS, I found that all previously mounted directories were converted into “container stores.” I’m now unable to add, edit, or remove them via WinBox. Could someone explain why this happens? (seems the changelog said *) container - allow to mount individual files, not just directories; )
does it mean we can only mount configuration files like config.json, config.yaml ?
Regarding re-setting “container store“ directory type for mounts on container start, this change was introduced with ROS 7.20, current workaround is eather to delete .type file in mounted directory from container shell when container is started and directory contents should become visible from ROS files and its Winbox section (temporary, until container is restarted) or use SFTP to upload files directly into that directory, when using SFTP it is not restricted.
Never tried mounting single file into container, try it and report it back how it behaves…
That works! Thank you!
After deleting the .type file, directories come back in winbox again. (sometimes you may need to exit winbox and login again)
Not sure it is a bug or a new feature ?
You never know with MT, I was more liked previous behaviour too.
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All bugs are hidden features. 
7.21beta3 does not have the problem. So it's probably not an intended feature.
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that’s good news, just wait stable version release
Something similar happend to me. I had to add manually .type files inside root folders of containers mounts because when a mount dir has hundreds of folders and files it expands and the winbox file manager becomes unreadable and chaotic. A function to expand or collapse the tree for each mount would be very useful imho (or a simpler function to set or unset a mount as directory or container mount). Anyway I hope that the fact that adding a .type file collapses the mount will be mantained because at least there’s a way to collapse somehow even if it's not a very easy way