TLDR: If you don't use online banking, you can manually upload bank statements as pictures or PDFs by selecting ‘+Add an account’, then ‘My bank is not listed’, and choosing the upload option.
Manually providing statements
If you don't use online banking, you can upload bank statements directly from your device instead. These can be shared as pictures or PDF’s.
To share pictures or PDF’s of your bank statements, select ‘+Add an account’, ‘Next’ and then ‘My bank is not listed’ which will appear at the bottom of the screen.
You will then be given the option to upload documents instead. You can read more about how to upload statements here.