I was curious on the PS details. At this time I thought I’d share with others who might not know all the details:
When the COVID-19 pandemic shook up rosters in 2020, the NFL decided to expand practice squads to 16 players.
With an exception: NFL teams can have 17 players on their practice squads, with one caveat: One practice squad member has to be a member of the NFL's International Pathway Program.
Of the other 16, 10 must be rookies or second-year players.
so, Up to six of the 17 players can have unlimited NFL experience, which is a big development in recent years. Previously, players could have no more than two accrued NFL seasons for eligibility.
Every Tuesday, teams can designate four players as protected, so they can't be placed on another team's active roster from that day until kickoff.
Two players can be promoted to the active roster on game days. Then they return to the practice squad, unless the team offers a one-year deal.
Teams can't activate a player more than twice; after the second time, they must decide whether to promote him to the active roster.