Not as it was already requested to add documents to specifics logins, which is also a great idea. Here it is a request to store documents we want to secure and we could need for specific administration information, like passport, id card, etc... We could be free to add them to Proton Pass, if I want to store all the data of my family in my Password maanger, like for 1password or Bitwarden, I should be able to do it also with Proton pass.
This is really needed in the Proton Pass, or any Password Manager, so you can quickly retrieve them without going through a Cloud Drive. More quick because we have a specific category for the documents ("Documents" category, not "Passport" etc... category, it must stay general).
It is not a competitor of Proton Drive, because we will store mainly identity documents, or specifics documents we need to retrieve quickly, and the space in Proton Pass must be below Proton Drive, so this is not an internal competitor in between your 2 apps.