Make sure that the document view is set up to be a single page at a time. If the document view is for two pages, RoboBraille reads left to right across both pages and the end result is nonsense.
Review, read, or listen to the end result before posting, especially for courses with complex terminology.
If you have problems with a specific file, try copy and pasting the text into a new blank document and then upload the new document to RoboBraille.
Scan your documents using the highest quality setting (largest number of dots-per-inch DPi) whenever possible.
You cannot translate a document to an audio file in a different language using RoboBraille. However, when you select the native language, the RoboBraille audio files will sound like the selected language.