You want this on your phone, your laptop, and your Firestick simultaneously. Here is the exact file structure I use:
For a smooth experience on mobile or low-spec portable hardware, use players that focus on speed: 10000 m3u playlist portable
: Be aware that 10,000 entries can cause significant "hang" or loading times on some apps. Using a dedicated editor like m3u4u can help you prune and organize these lists online before downloading the final portable file. You want this on your phone, your laptop,