Auto-posting videos on social media

Hello, I need a Telegram bot where I can upload videos 5-10-30 times a day, and it automatically posts these videos on TikTok/FB/Instagram/YouTube Shorts.

Attention, there is a reference and a ready file n8n(json), and there is also a video demonstration on how to assemble everything on n8n; I need help with the implementation. I have attached the file below.

I need to be able to choose the start time and the interval between publications of 15-30-60 minutes or several hours.

To be able to choose from already prepared captions (descriptions) for the videos or enter my own manually.

For YouTube Shorts, there should also be an option to choose a description but of a smaller size due to character limit restrictions.

There are ready references and even n8n templates on how this can be done, but since I couldn't figure it out myself, I need help from a professional.

In general, the template is almost ready, but there is no option to upload videos to the Telegram bot. This feature needs to be added.