I have a similar project with 5 pages of PDF applications along with Personal info for people we are keeping track of. I choose Firebase for this as it has a separate Database and Storage sections. No matter what File Format (mine are PDFs) you have, you can store the files on Storage. You can upload right on the Firebase Console or at a command line with their gsutil command:
gsutil -m acl ch -r -u firebase-storage@system.gserviceaccount.com:O gs://<your-cloud-storage-bucket>
// Get a non-default Storage bucket
var storage = firebase.app().storage("gs://my-custom-bucket");
So we already have the tools to deal with Storage files built-in to Firebase.
