As you stated, look for readability, no missing pages (piggybacking), controls for importing, indexing and retrieval. Also ensure there are dates so that files can be destroyed (deleted), and safeguards to prevent accidental destruction. (Same as paper, when 25 months are up you want to get rid of adverse actions & files. If files have been destroyed, the bank cannot be bitten by a rogue examiner with too much time on their hands.) Also be sure the files are appropriately backed-up and included in your disaster recovery plan.
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Integrity. With it, nothing else matters. Without it, nothing else matters.