The MLA follows Merriam-Webster, which states that media can be treated as singular or plural when the reference is to mass media (“Media”). So you may choose either style as long as you are consistent throughout your paper:
The media is reporting about the gala.
The media are reporting about the gala.
“Media, N. (1), Often Attributive.” Merriam-Webster, 2019, www.merriam-webster.com/dictionary/media.
Published 26 February 2020