In order to use the confirmation Messages in a user friendly and Business supportive way it might be considered to include an Option to suppress subsequent confirmation Messages for example within a bulk upload of hundreds of files.
from a technical Point of view it is totally clear to accept each file by itself - but from a Business Point of view there should be an Option to have a single decision for a complete Transaction. maybe the confirmation page is just shown once and in the Background all files are tracked and logged.