I am not exporting my app. say i created one mashup . so mashup get created in C:\ProgramData\Qlik\Sense\Repository\Extensions . and if i want to run my mashup so in url i am writing
https://servername/extensions/mashupfoldername/mashup.html ... But if Same Mashup folder i copy and paste on
my destop and run the mashup.html . so it should show the page with qliksense object
the mashup is a web page, so it need to be run in a web server. Qlik Sense includes a web server that can server your files from Extension directory and subdirectories, but if you want to have them somewhere else you need to use another web server like Microsoft IIS or Apache.
Hope this helps