Can I record what a repair cost and attach the invoice?
Yes — a VAT-inclusive cost and one invoice file per request, both landlord-only and stripped out of anything a tenant can see.
Each maintenance request takes a cost figure (VAT-inclusive) and one attached invoice. Re-uploading replaces the previous file rather than building up a list.
Worth knowing: Both are landlord-only, and enforced on the server: the cost and invoice fields are removed from tenant responses before they're sent. A tenant cannot learn what you paid for a repair by any route.
Getting it all back out in bulk is the expense report.
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Not legal advice
These answers describe how Tenarize works and summarise the law in England as the product implements it. They are not legal advice about your situation, and the law changes. For free independent help, Citizens Advice and Shelter both cover renting in England; for anything unusual or contested, take advice from a solicitor.
Tenarize does not currently support Scotland, Wales or Northern Ireland, whose tenancy regimes are different.