I am applying for a research assistantship at a university, and I am required to upload a cover letter for submitting my application. I am not familiar with cover letter, since I'd only applied to student positions before, where I was required to upload an SOP and a CV, instead of a cover letter and a resume. This application still requires a CV, and not a resume, but instead of SOP, it requires a cover letter.
I looked for cover letter templates online, and it has the form of a letter (starting with "Dear..."), and "sender" and "recipient" addresses on top of the page, which sounds weird to me since it is not 1918 ad I am not posting it to them, I am uploading it to their application portal, and my address is also on top of my CV and I separately enter my address when I fill in the application form (and they know what their address is, so I'd say they probably don't need me to write it for them on top of my cover letter!).
Is it just an outdated thing, or a convention that I need to follow?
Also, given the position is academic, do you think is it ok if my letter is some sort of a hybrid of cover letter and SOP?!