Resumes, cover ... documents. It is preferable to use large mailing envelopes, rather than folding the letter and resume. Your resume must be perfect. No errors. Do not rely solely on spell check.
While it's tempting to hit the fast apply button and attach a generic cover letter to every application, that's probably not ...
If you are submitting your resume as part of an online submission form and there is an “other documents” section, you can attach your cover letter there. If there is no “other documents” section, you ...