Introduction - If you have any usage issues, please Google them yourself
(1) IIS did not open the "enable parent path" (modified method: right click - > - > - > the main site attribute directory configuration - > Options), modified, must restart IIS.
(2) IIS did not open the "enablesession" (modified method: right click - > - > - > the main site attribute directory configuration - > Options), modified, must restart IIS.
(3) IIS site, without users write permissions (server open write permissions: find the main site directory folder - > right key > > security attributes - > Add - > Advanced - > investigatedimmediately - > Add "Internet guest account" or "IIS_WPG", write permission.).