I have set agenda files to refile captures, which codes show as below

(setq org-agenda-files (list "~/org/))

Also, include refile codes

(setq org-refile-targets '((nil :maxlevel . 2) (org-agenda-files :maxlevel . 2)))

(setq org-outline-path-complete-in-steps nil)

(setq org-refile-use-outline-path 'file)

The main problem is I can not find files I set in the org-agenda-files when I want to refile my capture in completions