Some recruiters may require an application of one document only, which means that you may need to combine your resume, cover letter and other documents like references, into one file.
How to go about that?
Although in the current version of the builder it is not possible to merge the created files automatically, there's still a way to do so.
Once you download your files in PDF format, you need to search online for a software that will allow you to merge your files (very often the first few samples are free!).
A quick online search should solve your problem. One of the online services we recommend it SmallPDF.