Where a channel withholds its earlier history, newcomers can no longer open, reply to or schedule a reply in a thread begun before they arrived, nor reach older files, call recordings or a K Buddy summary of them. A call recording can be deleted only by whoever recorded it or an owner or admin, and in Kemble Circle by a moderator who outranks everyone recorded.
HEIC, HEIF and AVIF photos and MP4, MOV and WebM videos are stored without where they were taken or filmed and the device that made them, including the location some cameras record throughout a video, as the privacy policy now says. On a device with several accounts, more of what one account loaded is cleared when you switch.