Assuming an application is "safe"
BHFH classifies features, not applications. Most mainstream illustration software now ships ordinary and generative tools together. Using Photoshop is fine. Using generative fill in Photoshop is not.
Not disclosing something because it seemed minor
Disclosing costs you nothing, and we read it as context. Leaving it out is what looks bad later.
Replacing the artwork file after declaring
Your declaration describes a specific piece of work. If you swap the file, the declaration no longer matches what's listed, so BHFH moves the listing back to draft and asks you to declare again. It isn't a penalty. It keeps the record accurate.
Treating an audit as an accusation
Many audits are random, and being selected doesn't say anything about you. The worst thing you can do is not reply. An audit that closes with no reply is recorded that way, while "I didn't record my process" closes it cleanly.
Thinking evidence is a competition
More files don't mean a better label. Evidence is counted once per *kind*, so five sketches count the same as one. A few different kinds help more than lots of one kind, and none are required.