I'm part of the GJ File Manager team. When organizing converted documents for a handoff, a new filename and a successful open are only the first checks. The recipient may need editable text, usable tables, or a particular layout, and those are different requirements.
Here is a small acceptance checklist you can use regardless of the converter:
1. Keep the source and converted output separately labelled. Work on a disposable copy of the output during testing.
2. Open that copy in the app the recipient will use. Check a text-heavy page, a table, and a page with images if the document contains them. Check the final page too; a convincing first page can hide missing material later.