which is mostly designed around annotation and spaced repetition.
You can store all your documents and web content in one place and since you're obviously trying to read and retain all that information it might be interesting to enable this as a one-off feature to see if it helps.
Another idea could be to just have them for the flashcards since this is the key information you're trying to retain.
I'd like to see more research here and see where it can be used and how it can be used.
I've been working on an integrated offline browser for documents and annotation named Polar:
https://getpolarized.io/
which is mostly designed around annotation and spaced repetition.
You can store all your documents and web content in one place and since you're obviously trying to read and retain all that information it might be interesting to enable this as a one-off feature to see if it helps.
Another idea could be to just have them for the flashcards since this is the key information you're trying to retain.