* file upload/download
* 3pid/email/requestToken untrusted server '' thirdpid config of phone and email failing
* video/voice calls
  https://landchad.net/coturn/
  https://landchad.net/dendrite/
* media on s3
  https://github.com/turt2live/matrix-media-repo/
  https://quentin.dufour.io/blog/2021-09-14/matrix-synapse-s3-storage/
* migration
  https://ems.element.io/tools/matrix-migration