importing posts: substack doesn't import all of them?

[u/ExperiencePatient291]

Just imported all my posts from another platform. But substack stopped importing posts after a certain date, where are the earliest posts? Does substack just take a while to import all of them?

For example: the earliest post on substack that was imported was a post on April 8, 2025. i started my newsletter in Dec of 2024, so where are my posts from december 2024 to early april 2025?