I add these in vimrc
let g:mdip_imgname = 'test'
function SavePic()
let pp = expand('%:t:r')
let g:mdip_imgdir = pp
endfunction
autocmd BufEnter *.md call SavePic()
and it worked in windows.
Now I use it in Ubuntu 20.4, it can save the picture in the custom path, but in the markdown file, it inputs a default name and default path text.
After "leader"p, If I just press "Enter", it shows:

If I type "asdf", it shows:
Which means, these setting in Windows, it worked. But in Ubuntu, it didn't.
And in Ubuntu, it's saving function is OK. But the input text, it didn't work.
I think may be the problem is in the mdip.vim, the Linux part?
I'm try my hard to read the mdip.vim file, but it's difficult to me...