If you have a comma in a file name, for example "Data Model - 1,000,000 Records" it won't export from Qlik Sense.
Removing the commas from the name fixes this. I imagine it is just because a comma in the name makes it an invalid URL or filename and that character just needs to be purged.
It doesn't fail very gracefully or give you an error. The export succeeds in completing and you get a green check mark but then the file never downloads.
