Short answer
Use the client area for orders, invoices, payments and tickets. Your files are in Nextcloud, which has its own sign-in: its address and username are in your welcome email and in the client area under Services.
Why the client area says TekLan Hosting
TekLan Cloud is part of the TekLan group, and every TekLan service is billed and supported from one client area at client.teklanhosting.co.uk. If you also have hosting or a VPS with us, they are in the same account.
Finding your storage details
Sign in to the client area, open Services and choose your storage plan. Its Nextcloud address and username are shown there.
Questions people also ask
Is my Nextcloud password the same as my client area password?
No. They are separate sign-ins. Changing one does not change the other.