Been having issues with folks logging out…then unable to decrypt after signing in again. Even tho they use their passkey, prior messages will not decrypt as they were not logged in anywhere.

So trying to understand some use-cases:

• If someone is only logged-in on their phone, go somewhere without a signal (e.g., plane, hiking), and then get signal again…will they be able to decrypt messages sent while they were offline (but never chose to sign-out)?
• If NO…will they be able to decrypt prior messages they had been able to decrypt (i.e., just not the ones sent while offline)?
• If they lose their phone (again, only source of logging in)…will they be able to backfill messages when setting up a new device with their passkey?

Sorry for the perhaps basic E2EE questions…getting traction with my family using Matrix, but worried about some spouse-acceptance concerns.