Help with exporting a file

Hello folks,

I am trying to get a file of an event onto a USB stick and seem to be failing dismally.

I have gone into the export menu and have identified the file that I want. To be on the safe side I have 'locked' it, I'm not sure if that is of any help though.

Having identified the file which is 11.33MB in size, I then click on 'Export' but when the page changes nothing is showing to export. the file size is shown in the bottom corner of the screen.

Does anyone have any thoughts on...

Help with exporting a file