After debugging, I found that the media_root set in the setting added a comma like static, which caused the path to become a tuple, so an error was reported, just delete the comma.

STATIC_URL = ' /static/ ' 
STATICFILES_DIRS = (
    BASE_DIR / ' mytest/dist/static ' ,
)
MEDIA_URL = ' /media/ ' 
MEDIA_ROOT = (BASE_DIR / ' mytest/dist/files ' )

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