Proof of delivery is most useful when it is captured at the point of delivery and immediately linked to the customer reference and job.
Define the minimum evidence
Decide when a recipient name, signature, delivery photograph or document is required. Make the app explain missing items before submission.
Handle exceptions explicitly
Shortage, damage, refusal, failed access and partial delivery need a reason, notes and evidence. Do not force an inaccurate “delivered successfully” status.
Make office review fast
Show the planned job beside the actual completion time and evidence. Authorised staff should be able to download or share a coherent record without assembling it manually.