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Openemr 6 - Not able to Upload Documents

When try to upload a jpg file for a patient, After choosing file when click on Upload, Nothing happens… - there is a blank screen
Screenshot is attached…
Thanks

After Turning on Debugging Log Option -->
" Fatal error : Uncaught Error: Call to undefined function mime_content_type() in C:\inetpub\wwwroot\openemr\library\sanitize.inc.php:112 Stack trace: #0 C:\inetpub\wwwroot\openemr\controllers\C_Document.class.php(236): isWhiteFile() #1 C:\inetpub\wwwroot\openemr\library\classes\Controller.class.php(126): C_Document->upload_action_process() #2 C:\inetpub\wwwroot\openemr\controller.php(6): Controller->act() #3 {main} thrown in C:\inetpub\wwwroot\openemr\library\sanitize.inc.php on line 112 "