Displaying .mht file in html module in DNN

In our DNN site we need to display many .mht files in the html module. I did it by ifram开发者_如何学运维e tag, but the file is not loading when the site is browsed for first time or when the page is refreshed by Ctrl+F5. When the page is refreshed second time by F5 the files are loaded and displayed. Why are the files not loading when the page is browsed the first time.

Also, I uploaded the mht file to the server through FTP, is there any other way to upload the mht file to the server

For your second question, you should be able to upload the files via the File Manager (Admin -> File Manager), though you may need to update the list of allowed file extensions on the Host Settings page first (in the Other Settings section).