Fast forward and advertisement rules depend on the channel and whether the program is on-demand. There are three experiences:
You can fast forward through any saved shows that have been recorded, i.e. tiles marked with the tag 👏(Video) How to Fix an App that wont Open on your Fire TV Stick
You can fast forward but the last ad break is required (... unless you watched it already).(Video) Justice: What's The Right Thing To Do? Episode 01 "THE MORAL SIDE OF MURDER"
You cannot fast forward past the furthest point you have watched.(Video) PHILODENDRON BIRKIN PROBLEMS and HOW TO MANAGE THEM / MAIN ISSUES OF BIRKIN and HOW TO FIX THEM