Spoiler statute is the same as it is it is for apping.

Thank you for that second question! I actually meant to address this in the main post. Memories are being "Sent" by a future version of themselves, and that future version is static, the same end point/canon point is sending all of these memories, so anything they do not remember they cannot send.

Likewise, if there are any memories in which different characters perceive different things - such as mental communications that can only be heard by a select few characters or scenes where multiple people are seeing the same thing differently because magic, those memories will not come through.

Hope this helps and thank you for the questions!