Save what you finished
Open a series page and find Seasons and your place. Select the season and the last episode you completed, then press Save checkpoint. The message beneath the form tells you which selection was saved. This is your own note; it does not watch a player or guess when you finished an episode.
Returning after a break
My List shows episode checkpoints separately from saved posters. Open the series from its checkpoint to return to the details. You can check the episode guide before choosing what comes next. If you stopped halfway through an episode, leave the previous completed episode saved. There is no timestamp field to recover a minute within a video.
Keep versions apart
The animated One Piece and its live-action adaptation use different entries. Saving progress on one never advances the other. This also matters for remakes such as Cowboy Bebop or Avatar: The Last Airbender. Confirm the production year before saving a long-running series.
When a checkpoint disappears
Your note belongs to this browser's Seez storage. A different browser, private window or cleared site data may not contain it. Use the list backup before changing devices. Clearing a checkpoint removes the note, not the series from the catalog or your saved posters.