Although it is possible to create folders/branch, I can't see any way to move a bookmark into a folder. Are there commands missing in your documentation or am I misunderstanding the usage of these folders?

when opened the bookmark tree, i can open the history bookmark and overwrite it by press 'N', but i can not delete it by press 'D'.
however i found another way by press 'a' and input 'remove', then the bookmark could be removed.
could you tell me how to fix this?
env:
neovim v0.6.1
vim-config: rafi/vim-config

Error during neovim startup:

Error detected while processing /home/djromero/.local/share/nvim/plugged/fern-bookmark.vim/plugin/fern_bookmark.vim:
line    6:
E121: Undefined variable: g:fern#mapping#mappings
E116: Invalid arguments for function extend

And the bookmarks scheme doesn't work.

The relevant part of the configuration:

Plug 'lambdalisue/fern.vim'
Plug 'lambdalisue/fern-renderer-devicons.vim'
Plug 'lambdalisue/fern-bookmark.vim'

let g:fern#renderer = "devicons"
nnoremap <Leader>t :Fern . -drawer -reveal=%<CR> " open tree drawer and reveal current file
nnoremap <Leader>x :Fern %:h -reveal=%<CR>       " browse current files' directory

Before adding the bookmarks plugin it worked fine.

Neovim version: NVIM v0.5.0-360-g1f479fffb

Is it possible to open a bookmark straight without passing through the tree?

Something like Fern bookmark://${mybookmarkid}

?

It would be nicer to open the dir bookmark in the current fern buffer.

My init.vim has both

	Plug 'lambdalisue/fern.vim'
	Plug 'lambdalisue/fern-bookmark.vim'

If I open any file in neovim, e.g. my init.vim and execute :Fern bookmark:/// I get an empty Fern window.
Executing :messages gives the following:

[fern] ERROR: Vim(let):E121: Undefined Variable: g:fern#scheme#bookmark#store#file

This also shows up if I open Fern normally and press B to bookmark - no text in the status-line, and that error message shows in :messages.

This can be resolved by adding

let g:fern#scheme#bookmark#store#file = "~/.fern/bookmark.json"

to the vim config.

However, this variable is said to already have a default value of "~/.fern/bookmark.json" in the helpfile, and as such, I'm inclined to say this is probably a bug. Also, the GitHub readme only mentions the other variable.

Please consider checking up on that, and if it is intentional, I would like to suggest adding a message to the help-file and repository readme that users need to set it, as it is not necessarily obvious by default.

eg. I do not have d mapped to the remove action when the bookmarks are open.

Are the keycaps B, d, etc set as described in the readme ?