Unable to upcovnert detached luks1 header
Cryptsetup can't upconvert default detached LUKS1 header to LUKS2:
[user@machine ~]# cryptsetup luksFormat --type luks1 data_file --header hdr_file
[user@machine ~]# cryptsetup convert --type luks2 hdr_file -q
Unable to move keyslot area. Not enough space.
But file can grow, right?:)