Open Settings → Move from Sudomemo in Firefox Desktop. Install the signed Sudo2RexiMemo Migration Tool shown on that page and use it from your own Sudomemo Creator's Room to create one or more .S2R migration files.
RexiMemo verifies the archive, signed PPMs, metadata and upload dates, then shows a combined review list where you choose which Flipnotes to request. Sudomemo stars and star balances are not transferred. You can also choose one selected Flipnote to become your RexiMemo profile picture after it is successfully imported.
If every selected Flipnote passes the automatic checks, the request can import automatically. If any selected Flipnote has an ownership, duplicate, or other review warning, the request is still accepted and an administrator reviews every selected Flipnote individually. Duplicate warnings show the existing RexiMemo copy so staff can compare it and, where appropriate, explicitly allow a separate duplicate import.
The server currently expects Sudo2RexiMemo Migration Tool v1.2.5. Older migration formats are rejected.