9.5+4.0 Upload from server - blank modal "Select the file on server" window

[derry43]

• Windows Server 2012 R2
• IIS 8.5
• GLPI 9.5.7
• FusionInventory for GLPI 9.5+4.0
• PHP 7.4

No matter what I configure the "Root folder for sending files from server" as...

C:\inetpub\wwwroot\glpi\files\_plugins\fusioninventory\upload C:/inetpub/wwwroot/glpi/files/_plugins/fusioninventory/upload /inetpub/wwwroot/glpi/files/_plugins/fusioninventory/upload files/_plugins/fusioninventory/upload /files/_plugins/fusioninventory/upload

I only ever get an empty selection window "Select the file on server".

I have put some file_put_contents debugging in inc/deployfile_class.php ajax/deployfilemodal.php and ajax/serverfilestreesons.php and ajax/serverfilestreesons.php is never opened and the function getServerFileTree in inc/deployfile.class.php is never run.

I have checked the javascript console for any related errors and can find none, only the following when I click on the Package actions tabh.

    at Object.init (redips-drag-min.js?v=1.12.4:62:303)
    at redipsInit (drag-field-row.js?v=1.12.4:11:7)
    at <anonymous>:1:1
    at x (base.min.js?v=9.5.7:14:912)
    at Ft (base.min.js?v=9.5.7:25:47480)
    at jQuery.fn.init.append (base.min.js?v=9.5.7:25:48752)
    at jQuery.fn.init.<anonymous> (base.min.js?v=9.5.7:25:49901)
    at G (base.min.js?v=9.5.7:25:30000)
    at jQuery.fn.init.html (base.min.js?v=9.5.7:25:49564)
    at base.min.js?v=9.5.7:417:11786```