dd558ee created the issue

After uploading a set of large files to B2 (each of 1GB upwards) a basic, optional, supplementary confirmation system for double checking and displaying the SHA1 checksums of the stored files and the local versions, side by side, in a list, with a green tick for matching sums.

This would enable a final approval check before cold storing the local copy and adds confidence that the upload of multiple files has completed successfully without errors.

Currently the upload simply finishes with "Done" and a green circle. Whilst this might confirm the same thing its not as complete a confirmation as the above proposal.