macOS version:
ProductName: Mac OS X
ProductVersion: 10.14.3
BuildVersion: 18D109
Kap version:
3.0.0 Beta5
Following export, Kap shows the automatically generated filename as "successfully exported", not the edited name
In this case, Kap should show "Demo.mp4" as the exported filename, not the automatically generated name as a file of that name was not exported.
Live with it. ;-)

So, the file should actually have the right name. In the exports window we don't really have file names since most services just upload it somewhere, so we generate the title again. I guess if you use the save file service, there is a name, so we can use that instead of the default
@issuehunt has funded $60.00 to this issue.
Most helpful comment
So, the file should actually have the right name. In the exports window we don't really have file names since most services just upload it somewhere, so we generate the title again. I guess if you use the save file service, there is a name, so we can use that instead of the default