Problem syncing videos between mobile app and website

I created an account so that whenever I wanted to resume watching a video between the mobile app on my phone and the website on my laptop, I could watch from where I left off. There doesn’t seem to be any syncing between the two platforms. Only way for me to watch a video from where I left off is to watch on the mobile app alone. Any way to fix this? I am logged on to both the mobile app and the website, so my favorites are saved. Any advice would be appreciated. Thanks.