Customers would like to add a file name field to the export image/ppt/pdf dialogue where the user can give the exported file a proper name. As it is now, you will get a cryptic file name when you export sheets/stories. Most likely is that the end-user will change the file name when the file is downloaded.
The default name could be the name of the chart/image/sheet/story followed by date and time.
Source: https://support.qlik.com/articles/000077794
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