I've already looked at the online help - the only relevant advice there is "Save it to the Cloud (i.e. Dropbox, Google Drive) and import it on your other device.)" but what I need to know is how to do this.

I've also been thru the in-app tutorial - problem is that what appears in the tutorial is different from what appears in the app.

The tutorial shows the sharing options menu as

EMAIL
HTML
PDF
IMAGE
FORUMS
MUSIC XML

But when I select it in the app, the menu is

EMAIL
PDF
IMAGE
FORUMS
MUSIC XML
PRINT

i.e. it is missing the HTML option which - as I undertand it - is the one I need to export the chord chart to Dropbox for transfer to another device?